Recently I've started seeing videos that I know for a fact I never started watching, showing a bit of progress bar, implying that I started but didn't finish the video:

That seems like a pretty obvious attempt to lure me into watching something that the algorithm has determined I need to watch, and I would be satisfied with that explanation alone, but...
Also it has decided that I am intensely interested in two specific hotbutton social/political topics that I am absolutely not interested in, and it keeps steering me toward them. I click on a funny cat video and afterwards it shows maybe one or two more cat videos and then right back to one or the other of the things that I don't care about.
These two things combined make it feel more like someone else has been using my youtube login to watch things that they're interested in, corrupting the dossier that youtube AI keeps about me. I am fairly certain that this is not actually the case but I have changed my password more than once to make sure, yet it persists.
Now I am wondering what prerogative there could be for YouTube to deliberately do this. Any ideas? Similar experiences?
P.s. I pay for YouTube premium so there are no ads. So I don't see how advertising could be part of it.

That seems like a pretty obvious attempt to lure me into watching something that the algorithm has determined I need to watch, and I would be satisfied with that explanation alone, but...
Also it has decided that I am intensely interested in two specific hotbutton social/political topics that I am absolutely not interested in, and it keeps steering me toward them. I click on a funny cat video and afterwards it shows maybe one or two more cat videos and then right back to one or the other of the things that I don't care about.
These two things combined make it feel more like someone else has been using my youtube login to watch things that they're interested in, corrupting the dossier that youtube AI keeps about me. I am fairly certain that this is not actually the case but I have changed my password more than once to make sure, yet it persists.
Now I am wondering what prerogative there could be for YouTube to deliberately do this. Any ideas? Similar experiences?
P.s. I pay for YouTube premium so there are no ads. So I don't see how advertising could be part of it.