Methinks you protest too much.
You may be right that it depends on the type of SP you see, if you review an SP who sees relatively few clients you are more likely to be recognised. I suspect it has more to do with how unusual the services you request (such as RO or anal), and how detailed an account you write.
Some SPs use the booking and feedback features of AW. Some don't
Some display their phone numbers, so you can make a direct booking without using the bookings features of AW. Some don't
Some people (SPs and SSs) want to rack up feedback counts on AW. Some don't
If it was non-standard services or a particular outfit/venue/something non-standard on the booking then most reviewers would be smart enough not to mention in their review OR they might mention it because they want the SP to know who they are.
Some SPs just use AW as advertising and only take bookings on the phone, so you don't leave feedback.
Some SPs are tourers from overseas or pimped or don't have English as their first language and may struggle with using AW, so just use AW for advertising (possibly having had someone else write their profile and populate their likes list) and make you call or text for bookings. If you see one of these SPs you'll leave no trail.
Some SPs never read their messages or booking requests on AW, so no trail is left.
If you see SPs who work for agencies or in parlours then they'll be no trail on AW, but they still may figure out who you are based on the SPs you have left reviews for and possibly jow often you visit/when you visit/things that happen - chatting to the receptionist while you're waiting.
There's a number of ways they can figure your identity out (e.g. incalls/outcalls booking - outcalls are probably less common so that reduces the possible identities), which is why it pays to change some things in reviews.
As Katie said early she can usually figure out who you are and SPs sometimes share info.