> Git is open source/public domain. Trademarks don't apply to it.

Public domain and open source are two completely unrelated concepts. If open source were public domain, you could not license usage of it (MIT, GPL, etc.). What is the point of confidently asserting something you're completely ignorant about as though it were factual?

That’s not right. You can very much apply trademarks to open-source software. See for example Mozilla Firefox. Also, open-source and public domain are not the same thing. Finally, git is GPL.