I trust Proton's privacy aims as much as I can trust any corporation, which is to say very little but way more than Google. I do feel the company prioritizes privacy and eg. bases itself in countries with privacy respecting laws (hence leaving Switzerland after their recent legal changes that risk privacy). I think this is a more important signal than the CEO's tweet supposedly favorable to Trump (which I dont like but also dont find damning enough to override their commitment to privacy).

When I researched alternatives after leaving Google I ended up choosing Proton (I also considered Tuta) for Mail & Calendar. For me they are the best option for privacy and usability, and something my non-tech family can use, which is a major win because otherwise they would not be able to leave Gmail.

I dont use their other services because I don't want to put more eggs in the same basket.