"They" will recommend you irrelevant shit cos it's the way "they" manipulate public opinion, directing the people attention to what "they" want to, that's why you see irrelevant shit, it's not all about recommending you things based on the information "they" have about you.
These platforms don't make money just selling you stuff, "they" make money also directing your attention and manipulating it in the direction "they" want to.
If "they" make 10 bucks for selling you physical shit, "they" make 1000 bucks selling ideological shit following their owners agenda.
Maybe I am more paranoid than you haha..
Going to the point: not all the shit mainstream social media algorithm shows you it's about the information they have about you.