People have been noticing this a lot recently but what nobody seems to know is that this is a form of money laundering/“scamming.” I know because I used to be active on crime forums and talked to some of the people who engineered this scheme. People will set up fake Spotify artist accounts with stolen identities and bank accounts, pay a musician for songs that pass as music, and then bot millions of streams on them.…
Happens to me a lot on Youtube too - you watch just one thing - and now your recommendations are full of things like that one thing. Or Facebook/Youtube, somehow: I watched a single video on Youtube about Viking sword fighting and suddenly my people recommendations on Facebook were at least 20% militaria fans, always visible from the profile picture already. It finally stopped but it took well over half a year.
That's why I thought this story was about recommendation systems recommending either only narrowly what you already know, and finding something new is not really well supported or not better than random, or that one outlier can skew your recommendations for a long time. Worst is there is no way to tell the system "stop recommending me this kind of stuff" at least for the second problem, no manual way to make adjustments for the user.