Surely they could do an overlay like what channels already put in with their logo, with a couple-pixel discrepancy (an 8x8 pixel shape with only 10% opacity or

Surely they could do an overlay like what channels already put in with their logo, with a couple-pixel discrepancy (an 8x8 pixel shape with only 10% opacity or something) that translates to a user ID. Forums have been doing similar for close to a decade to figure out which user leaks info (we do it on some EVE Online forums).