It seems like you haven't really thought about this and are just personally against adtech and those companies. That's not how rights and legislation should be decided.
Selling items and running ads is not the same as supporting or fostering a bad act. People can similarly buy knives or many other potential and actual weapons, it's still the user that's ultimately at fault.
Now, sure, it can happen because you unleashed an algorithm on the world and don't know what it does, but you're still responsible for it.
Perhaps you want the government to tell you what you can say but I would prefer to go in the opposite direction and completely divorce speech from action, and stop trampling on our rights over the actions of a few. This endless shifting of blame solves nothing.
"Strangely" enough this does not apply when corporations' money is at stake, hence sites like The Pirate Bay are held responsible. Taking 2 opposite approaches for the same issue in order for the lobbying corporations to profit is a sign of acting in bad faith.
Facebook built this 2 billion people village, exploited them and collected taxes, then said "You know what? Policing it is hard so let the governments do it". And the governments should do it. EaaS - Enforcement as a service. And as any service it should cost. No personal liability needed, once money starts pouring out of the companies' coffers you'll see how quickly they find a solution.
In context with the fact that Facebook also served up the precise content day after day, year after year, which put people (the whole population) into this inconsistent-with-reality, individually tailored emotional state which is nothing if not a constant reflection and validation of their worst tendencies and pre-dispositions.
Think of an honestly shitty person whose problems are of their own creation in every way (for the purpose of this thought experiment, you can even pretend it’s not you). Do you think Facebook ever gave them a series of posts that reflects that? Or would they log on to see all the ways other people are the problem? And that’s everyone.
We all have flaws, but this is a profit-driven platform. And if you’re trying to sell someone something, making them feel like the true piece of shit they really are isn’t exactly in the ABCs of how to make a sale, much less at their machine-driven scale.
Facebook is basically the automated version of the guy rubbing a boxer’s shoulders in the corner of the ring, whispering in their ear a never-ending slew of made-up things the other guy said so that when the fight starts, he’s angry as can be.
Do you still think your position has merit? :-)