Don't feel bad about this because it's a super common belief to hold, but you're significantly under-estimating how hard it is to disappear off the internet in 2018. I would say, in some respects, it's actually impossible to be fully gone.
Odds are your ads are being scraped off of the legitimate places you advertise (or as another poster put it "consent to"). There's no way to prevent that from happening.
All that being said out loud probably makes you feel unsafe and out of control, but I'd like to offer a bit of hope in the idea that you've been getting along fine so far and odds are you'll continue to do so.
The reality is, there is no way to mitigate the risk if you're online, and being that you're already online, you might as well do everything you can to make that risk worth it in a financial sense. By that I mean, make your page rank highly for keywords you're interested in servicing in the market you'd like to service, advertise in places where you can prove ROI from doing so, and curate content that will draw people in to purchase your service.
>centralization of information
I have an easy solution for you here that some site that's scraping/rehosting your ads won't be able to subvert. Every image you publish online should be watermarked with your domain name (in this case theartofmimi.com). Here's a classy way of doing this: https://i.imgur.com/rLtxO9D.jpg (this is a mockup I made, so don't go looking for this girl, she's a lingerie model and probably doesn't escort, if you like this send me a pm and I'll email you the photoshop file).
Then, never list rates on an ad, always refer them back to your website (which you control). If someone contacts you asking about rates, again, refer them back to the website. This way, you'll have a single source of information that you control. Make sure that you, and only you, own that domain name (theartofmimi.com).
Someone else can build your site, but that domain should remain completely separate and owned by you to prevent foul play. Even if your hosting provider freaks out because of your line of work, you'll still own the domain separate from that, and still retain your single source of information.