Assume furthermore that a future hypothetical company is equally not good and the two collude to do not good things together.
Now assume you’re motivated to do something about it. Sucks for you, they have already predicted that and cleansed you because they know everything you’ve ever read and it was a high probability that you’d be against them.
Consider another situation where hypothetical evil overlords know exactly what buttons press in order to influence you to act a certain way. They press them regularly. You dance as expected.
Both circumstances undermine your personal autonomy and right to self determination. Furthermore they undermine the humanity that we share where our society is no longer controlled by the needs of humans, but instead arbitrary algorithms coded for whatever mundanely evil purpose.
And that’s the point (that you’ve more or less hit on), this is evil, but also so boring that it is actually a threat to society because no one will care enough to do anything.