According to bitnodes and ethernodes, there are around 150 BTC public nodes and 400 ETH public nodes located in China.
CCP hasn't launched an ISP level blockade yet which is one of the few cards reserved in their hands.
Since BTC has 3000+ nodes in TOR (Can't tell how many ETH nodes in TOR) , I think users in China could still have access to full nodes then.
China ban everything they think are harmful for their regime, not for their nation or their people. You can search in history that how many times China ban cryptocurrency. FUD news I meant.
Everyone is free to use Tor and to set up full node with Tor. China and other nations can not ban you to use Tor.