Sure in the beginning it adapts (according to some unknown algorithm) to what you feed it (in best case scenario who you are). I would however suggest that most people here are like me in that they every day try to learn and become less of an idiot, and thus incrementally grow as a person. I'm not the same person I was 10 years ago, and if I can't control how services see me (through my 10 year old history of my accounts), it will try to reinforce the me from 10 years ago, instead of showing me incrementally different results for the me I want to be tomorrow.
I'm sorry if this rant is confusing, I'm not sure how to coherently convey what I mean, but I'll try a TLDR;
If services only show you results/content based on how you were before, and force you onto a straight path (or rather, not even moving forward), isn't that what gets people stuck in echo chambers with only reinforcing information, never challenged, never growing?