What is stopping governments from making Ethereum and other crypto prohibitively inaccessible?

I'm pretty new to the crypto space and I'm curious to hear the community's thoughts. Say NATO member countries took collective action to protect their fiat currencies without outright banning crypto. If they decided to:

1) Force large fees on using crypto in daily transactions or outright limiting its uses to prevent widespread adoption.

2) Heavily taxing revenues based in the crypto space, which discourages new entrants and innovation.

3) Place barriers to entry in acquiring crypto by necessitating additional documentation and legal processes for both individuals and institutions, etc.

I really want to believe in Ethereum's future, but I'm having trouble finding some clear and intelligent discussion on this issue. Very curious to hear about how governments could actively push back against decentralized finance and how crypto (or Ethereum specifically) combats it.