Cambridge has updated their Bitcoin mining map, showing that Chinese miners produce 21% of Bitcoin's hashrate even though the activity has been banned there since June 2021. This hashrate share corresponds to a significant decline from the 46% in April 2021, before the ban.
However, it still shows that a substantial amount of the Bitcoin hashrate is illegally produced in China, proving that banning bitcoin mining is no easy task even for one of the world's most authoritarian governments.