From what I've heard, subscribers have some barcode that pops on the screen in random places for one frame, which can identify the user. That's why I don't blame them. I am, however, pissed about the non subscribers who post pictures instead of videos from the free rooms. Sabrina without panties on the couch with her legs opened? Let's make a picture of it an call it a day!
Mostly same as what canito posted, but in better frame rate, plus a bit of a dance in the end.
(The Video Content is no longer accessible and has been removed).