Derek Hunt covered most of it. The bit I would add on gay cam chat sites is below.
Where gay cam chat sites stands or falls is whether the recommendations improve with use.
I logged into the site at different times of day to get a read on whether the filters survive a refresh.
If you are only browsing, it is fine. The moment whether photos can be traced back to you matters, it changes.
If you only test one thing on that one, make it whether the sorting can be trusted.
Turning off read receipts made it far less stressful, though it did nothing for whether people reply or just collect matches.