There is a very simple and clear line, actually. The moment you have to write a single line of code to specifically enable political censorship, you're complicit in it. Such as in this case, where they're not just talking about e.g. taking down links in search results when asked, but inserting new code into the entire Android software stack, or even writing new apps outright, to enable such censorship.

And yes, of course it celebrates our own values. Why should we use any other values to judge our companies? If they don't want to be subject to this, they can always split their Chinese branch away entirely, and let it be run by the locals. Then it would be a Chinese internal matter. But when software engineers in California are implementing censorship for Chinese government, they're going to be criticized by the standards that apply in California.