Different jurisdictions generally have their own lawmakers (mostly democratically elected in 'sane' places), and they can decide what they want or don't want to ban.
I'm not really in favour of bans here, because just as no one forces you to enter a casino, no one forces you to trade on a cryptocurrency exchange (or hold any cryptocurrencies at all). Matt Levine's Money Stuff reported a lot on people losing money in crypto over the last two years, and was always amazed that the media couldn't really find those sob stories where orphans and widows lost their life savings. It was always some guys who admitted that they gambled and lost.
However, if eg American elected officials, or their appointed proxies at the SEC, want to ban certain things, who am I to judge?
Here in Singapore the authorities are a lot more crypto friendly, which works for me.
(I don't hold any cryptocurrencies. My investments are all in the most boring index fund available.
My position on weird financial assets is the same as for drugs: I don't think cryptocurrencies are a good investment for most people (on the grounds of insufficient diversification, if nothing else), but I don't see any reason to ban consenting adults from them. By default, let people make their own choices.)