Why do so many providers use the word “Baby” in their name?  I’ve noticed they’re always Asian. Is this an Asian cultural tradition?  Personally, I find it to be a turn off .

Regardless of race, ethnicity or nationality, I'm just not hooking up with anyone calling themselves Baby. Even a hoary-headed whoremonger such as my has a line of creepy that we won't cross.  

So ladies will tag their profile moniker with “Baby”, even though they’re in their late 20’s.
As you can tell there’s a certain group of men who like them young, some even being very young 🤷🏻‍♂️

And it seems its more and more of the agency going that way. Me personally I find it a turn off when I see anyone labeled "Baby". It just comes off creepy that men are actually drawn to it, but it is what it is so... whatcha gonna do?

I think I've seen perhaps 2 non-Ks advertised using "Baby" in their names.

You're right, and why should they? They have a different business model. It's about low rates and volume. There isn't a competitor in their price range that's using real pics. I'm sure if they were matching indie rates they would lose a lot of customers who wouldn't tolerate the fake pictures and older than advertised ladies. And for the more savy clients, it's easy enough to find out who's more attractive, actual age range, and quality of service.