But here's the kicker: What's worse, ragebait, or echo chamber where people only hear what they want to hear?
Good point, but also a false dichotomy. There IS a middle ground, where some (arbitrary until research gives further guidance) amount of "what I'm interested in" is mixed with some other amount of "everything else regardless of my viewing and posting history" and delivered as posts, recommendations, or whatever.
Of course, this would ultimately result in less addiction to the platforms, and therefore less profit. I see that as yet another argument in favour of social media being regarded as part of the common; by this point in time it's effectively societal infrastructure anyway, so it should be a tax-funded and government-run thing, kind of like a utility.
I can already here the objections, and I'm not presenting it as a finished solution, but rather as a talking point. Clearly, corporate-controlled social media of ALL kinds need to be very heavily regulated and/or dismantled. A LOT of the corporatocracy needs to be dismantled.