There is no need to ban them unless there is a particular local problem, like in Kazakhstan. Because proof of stake is technically superior for network capacity

There is no need to ban them unless there is a particular local problem, like in Kazakhstan. Because proof of stake is technically superior for network capacity, proof of work blockchains will slowly die away. Users switch to better solutions. For example, there will be only proof of work coin (bitcoin) left in top 10 market cap by the end of this year.