Geoblocking China and Singapore solves that problem, it seems, at least the non-residential IPs (though I also see a lot of aggressive bots coming from residential IP space from China).

I wish the old trick of sending CCP-unfriendly content to get the great firewall to kill the connection for you still worked, but in the days of TLS everywhere that doesn't seem to work anymore.

Only Huawei so far, no? That could be easy to block on a network level for the time being

Of course we knew from the beginning that this first stage of "bots don't even try to solve it, no matter the difficulty" isn't a forever solution

AliCloud also seems to send a more capable scraper army, but so far they're not using botnets ("residential proxies") to hide their bad practices.