I used to have some problem with some Chinese crawlers, first I told them no with robots.txt, then I see a swarm of of non-bot user-agents from cloud providers

I used to have some problem with some Chinese crawlers, first I told them no with robots.txt, then I see a swarm of of non-bot user-agents from cloud providers in China, so I blocked their ASN, and then I see another rise of IPs from some Chinese ISP, so I eventually I have to block the entire country_code = cn and show them a robots.txt