Besides, how will they know? Creating a new proxy account for every real account would make it almost impossible for Anthropic to know that someone is coming from China, only that some set of accounts (say, 100k) are coming in from a small set of IPs, but they're still paid accounts!
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[1] The idea is probably DoA for other reasons, such as why would someone proxy through you when they can use a VPN. Or openrouter.
Yeah, sorry, that was a joke :-) In addition to Openrouter, I think big users from China can fairly easily set up a company in Singapore or something (to get volume discounts, perhaps).