I'm against it. I suppose I'll have to be the one who rolls out the old chestnut of, "Look how well Prohibition worked."
When something is banned, it goes underground and more dangerous or morphs into something equally bad.
Yes, less people smoke these days but then somebody came up with the vape and people who had never smoked or had given up, turned to the new, more socially acceptable sucky pipe in droves and indeed, setting up or frequenting that novel and delightful high street institution, the Vape Shop.
Younger people drink less alcohol because it interferes with their weed and coke habits. Also with the increased treatment rates of mental health issues with prescription medication, they can be used or traded "Recreationally" as well.
Ban boring old Facebook, YouTube and X -wait for the explosion of platforms developed by dubious entities that will be the 21st century equivalent of bathtub gin and bootleg whisky.
When YouTube went through a stage of heavy censorship a few years ago - along came Odysee, Bitchute, Rumble and a few others. They were clunky to use but they were there and full of wild stuff.
Deprived of Reddit, they'll move to 4Chan and 8Chan.
Although I think the real uproar will come from gamers. Apparently Twitch and Kick are included in the ban but interestingly not Discord, for now. Of course, a lot of the gaming community (as it were) are rather good at tech. They'll get round it.
Digital ID by stealth too, as PPs have pointed out.
It just has an touch of 1984 about it with a heavy dose of, Aldous Huxley's, "Brave New World."