Re: You don't say
The big problem is that it has all the subtlety and sensitivity of a brick in a sock... watch one video on how to take an engine to bits, and that's all you see. Watch one on paragliding and that's all you see. Watch one on vintage computers and that's all you see... surely it is not beyond the wit of man to devise an algorithm that assumes that you might be interested in more than one thing (and incidentally, not keep showing you the same video you haven't been watching, as indicated above)?
Or - just speculating here, you understand - is it simply dumping the videos with the highest advert count? I don't see the adverts so I can't really comment. But surely youtube wouldn't be that obvious?