Seems like you're making up your own definition of 'caught'. Also half of the videos on this thread are spycam vids, I don't see them going away anytime soon.
To be fair,
1rkhachatryan didn't make up that definition. If you read the original post from 2012 it says:
i find it so very hot to see a guy being caught in the act, wanking [...] when someone comes in, like older brother, and they jump and quickly cover themselves with something stupid, like a notebook or something.
The fact that people have been (mis)posting spy vids doesn't change that. IMO, spy vids ≠ caught vids; but we can go on about this for 140 more pages and still not reach a consensus so oh well.