So what are reasonable Reddit alternatives that don't act as outlets of banned subreddits? Once you start banning stuff left and right, it's a slippery slope, making large groups of population feel weird/forcing them to learned hopelessness. It would be better instead to train some ML for content classification, then set user preferences about what triggers them, and then warn users that some submission might disturb them, requiring additional click to see the content in question. There ML would be just a helper, not sole arbiter-of-truth, and even an imprecise one won't have a stifling effect on free speech.

Of course, if Reddit owners/investors feel they need to fully submit to requirements of their advertisers, there is little they can do, and should just max profit and see if they can survive with a lot less "love" from their users.