In my experience, it’s their chat harnesses/website that filters historical events. The model itself doesn’t.

For example you can point opencode at DeepSeek v4 and ask, it will accurately tell you about Tiananmen square.

What it shows is that the CCP has enough oversight and control (either explicitly or by the companies making these decisions by default) that they will alter the models to benefit China.

Who is to say they aren't doing it in other ways as well? That they aren't, or won't be, subtly hamstrung in engineering work?

OAI and Anthropic have their own issues, you're right to be suspicious of them, but it's not like their models answer with, "capitalism is god's gift to His chosen people" or whatever. Their limits on cybersecurity, biological warfare, etc. at least make some sense in the context of lowering harm—not just protecting a specific government party.