Do you think people consider recommendation systems (feeds which inform their worldview) to be a part of natural order of things so they don't suspect it. Even if they know it to be algorithmic, nudges can be inserted at appropriate times when our guards are down.
meaning as we collectively get used to a technology we figure these kinds of things out, and even become desensitised to them.
of course people got taken by surprise at first (e.g. first trump campaign's use of those kinds of manipulations over recommendation feeds) but culture (youths and other children) do adapt and react to the "environment" or landscape
Probably the same psychology behind those obnoxious AI-generated ads that say things like "Here's the secret about gut bacteria that doctors don't want you to know!"