The whole point is for that to be a personal decision. Or if you think SM is bad, then it can be a collective decision to ban SM, like we ban heroin.
But ostracism? "Free for all,except those 5". Nah, I don't see it as a good choice, society-wise.
Off topic but I don't think banning heroin did anyone any good. We still need proper labeling, packaging, and storage laws. We still need laws that prohibit drugging someone without their explicit permission. We probably need laws that don't allow sale to minors. We probably need ban on advertising "controlled substances". We might even say certain things you can only get under medical supervision by a licensed medical professional.
I just don't think possession ought to be a crime like it is today. Endangering others, sure but possession is just asking for abuse by law enforcement.
Not really but that sense of learned helplessness is certainly good for their bottom line. I imagine it increases your propensity to buy whatever crap they're spamming your feed with.
In reality life without social media is a much happier existence.