I think it's pretty obvious that your explanation cannot be complete or accurate. Algorithmic feeds usually have a strong influence of what they want to show you, commonly pushing stuff you aren't interested in, or anything that will keep you on their app/site longer so they have more opportunities to show you ads. There are strong conflicts of interest here.

No one produces a feed that purposefully delivers content or ads that you aren't interested in. Those are bugs. Go look at the published X algorithm. You won't find anything in there that would attempt to show you things that don't match your interests.