(it's up to you to consider the ethics of this.)
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Scientific studies in evolutionary biology have shown that falling in love follows certain patterns.  These conditions can be arranged to allow the pattern to play out, helping assure the desired result.
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The SB/SD arrangement is already halfway there.  It sets up the proximity and intimacy into which the remaining conditions can be achieved seamlessly and naturally.
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The following four tactics assume you have a sexual intimacy before or during. You will mix the following tactics in with your intimate sessions for a week or two.  If love is going to happen, it should develop after that.
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1. Sit closely with them somewhere isolated and with a view, even better if the location is a bit taboo.
2. Hold hands.
3. Make prolonged direct eye contact.
4. Discuss life philosophy, something that induces self-reflection.
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The above is based on the evolutionary biology work of Malcom and Simone Collins as published in The Pragmatist's Guide To Sexuality.
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By the way, they also show that 73% of females are aroused by male dominance. So this should be your normal operating principle.  This merely means you set the agenda, etc. It doesn't mean you slap them around (at least not the ones not into BDSM.)

All you get is a Platonic relationship and a call in the middle of the night to come get them in a taxi where their "boyfriend" dumped them.

No, you are already fucking them in the SB/SD relationship.  This is extra credit.

...on what the motivation is for a SB to post on one of those platforms.  Some are of course using the sugar sites as they would any of the other popular internet dating sites, such as Match, or eHarmony.  Their intent is to find a steady companion, a boyfriend, maybe even a husband.  Lots of these gals, especially the more mature ones, may have found themselves excluded because they are unattached and viewed as competition by those who are attached.  And yeah, those four tactics will help move an arrangement more in the direction of a traditional relationship, no doubt about it.      

Agree!  No actually sounds like bad advice given by a ppm person.  LOL

All four "tactics" are just ways of connecting with someone in a romantic way.  

I thought the same things as I read the OP post.  I normally do those 4 things as part of simply being myself. Be yourself, be honest, and at least some of the SBs you approach will love that about you.  It's a numbers game anyway.  why bother trying to trick a SB into loving an act you are putting on?  Let her know the real you, as intimately as you are comfortable with. and things will progress nicely from there.

You can complain about it, but it has been studied and tested.

Science is clearly not in your area of expertise. In summary, self publishing your own studies as the Collins’ did is not considered credible...

It's from a published study by Arthur Aron, State University of New York, at Sony Brook, 1997.  Quite famous.
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Link to the published study below.

Come on WTF? Does anyone really need a full blown study conducted by a couple of pseudo-scientists to figure out that women respond to what has commonly been called "romance" since the beginning of history? DUH

It's actually a fascinating book by Malcom and Simone Collins.  Very honest.  Right at the start they say that 50% of published psychological studies cannot be reproduced.  They refer both to published studies and their own research.  They insist that people not just take their word for everything, but go look around for other studies that may contradict.
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On the other hand, 50% of published studies are useful.  So can't just dismiss all of it.
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You complain that everyone knows how do do romance.  This is tragically not the case.  The "nice guy" approach has been a disaster for many young men.  In their companion  book, "The Pragmatist's Guide to Relationships, they strenuously advise against trying to be the submissive nice guy.  These are not a politically correct books -- which is a strong point in their favor.
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I think there are lots of guys that want SB's to fall for them.  I personally don't.  That's why I stepped back from SB's and prefer pros.  But for those seeking real affection, and many suffering from the nice guy BS, finding out what really works ought to be a boon for them.

Of course women want a man with a spine, despite what all the woke hookers on Twatter try to tell you, but that doesn't mean they don't want to be romanced as well.

Journal of Who gives a Fuck.

Be nice, polite, and affectionate with her, and it will happen or it won't. The domination thing is something I have rarely experienced. I have had one relationship with a genuine sub and one with a gal who was more aggressive than I am. Both were among the kinkiest ladies that I have been with. The others have been more equal partnerships in private. She may have no interest in marriage if that is what you are looking for, but that doesn't mean she isn't interested in an ongoing relationship.

In other words, you got nothing.

Reading can be yur friend.

Let me know when they publish your rebuttal.  I'll read it with an open mind.

Love this discussion.  And I think many of us here have "Game" which is what the authors of this paper are really espousing.  Whether you get "Game" from trial and error, field research, or reading journals...you have to have it, along with cash money to thrive in the SB.  Helps to have looks and be physically appealing, but there is someone for everyone, so maybe not.  Perhaps the authors could easily have substituted some other independent variable (Tell them what they want to hear, open doors and display chivalry) and arrived at the same conclusion.  Yes, this article is in a throw away journal.  Does not invalidate their findings.  However, I believe the more appropriate application of these techniques is for FWB's/Fuck Buddies/Affair Partners, not SB's.  

Open mind - LOL LOL
Takes one to have one!

You went propaganda wise to attacking the ‘straw man’ (what does my publishing have to do with your argument) instead, which says your argument sucks fester-hairy dong.  

All this my dick is bigger than your dick shit you throw at out is tiring.

You do have a point. Enough unsexy talk.