A capitalist is someone who owns capital, not someone who supports capitalism. A liberal is someone who supports capitalism. I don’t think Linus is a liberal, given that he’s the Linux guy. But he’s obviously a capitalist, and that’s okay, that’s something you should strive towards if you live under capitalism, even if ideologically you oppose capitalism.
I agree with you, but to be fair, people don’t really choose an email provider. They chose gmail, because anything else is disallowed by everyone’s anti-spam measures.