Banning something is easy. But enforcing the ban is a whole other bale of hay.

China banned Bitcoin dozens of times before the "Great Mining Exodus" of 2021.

In the end, it comes down to the economics of eradication vs the economics of propagation.

It is currently an order of magnitude more expensive to forcefully turn off a Bitcoin node than it is to spin up a new node.

A regime would have to spend days and thousands of dollars of resources coordinating a takedown to locate and confiscate a single machine running Bitcoin core in someone's closet over tor.

Meanwhile, a resistance pony can spin up a new one on any PC in a few hours.

As with the china ban, they didn't have to forcefully take down every mining operation. They made examples of a few of the largest and propaganda made most hashrate leave "by choice".

Even still, there's a remnant in China that continues to ignore the ban.