> Basically all laws related to speech are abitrary.

True. This is a fair point. But the expected counter argument would be that the exact line isn't the issue instead it's the justification for the principle.

IE why is personalized algorithms more dangerous than general ones.

My answer (because I mostly agree with you) is that the difference is that personalized algorithms almost feel like brain hacking. And this brain hacking simply doesn't work at scale when applied to vague general algorithms.