@Lewdtime There was a post I saw some time ago where they figure out that they are following the traffic of payments.

So if someone clicks a link to pay you from your art page, they got you. If you have a fanbox, they got you. If you have people click a direct link from your art page to your ko-fi, they got you there too.

They are also following your cookies in your browser. So if you visit your own art page, baraag, or other marked sites before going to paypal, they got you.