China banned bitcoin mining and now there's hardly any bitcoin mining in China. Maybe the legal wrangling would be more involved in western countries, but I can't see why enforcement would be any harder.
ISPs already block bittorrent and blacklist domains. They could easily block bitcoin, too.
Actually, it's estimated that about a quarter of mining is in China. The largest players moved, the rest are lying low, so it's hard to get exact numbers.
> Maybe the legal wrangling would be more involved in western countries, but I can't see why enforcement would be any harder.
For the USA, computer source code is considered speech protected by the First Amendment, there's not much "legal wrangling" you can do around this when it has been confirmed by the Supreme Court. Short of drastically restricting this right/freedom... don't think the US population would welcome this "wrangling" with open arms.
You're also missing the point I've made, China's ban and various blocklists have not killed Bitcoin, it is still used a lot in China these days, it's simply illegal to mine it... for now, they've gone anti to pro Bitcoin many times over the years.
ISPs already block bittorrent and blacklist domains. They could easily block bitcoin, too.