FastMail is based in a Five Eyes country, ProtonMail is not.

Let's stop repeating this myth: https://arstechnica.com/tech-policy/2013/12/switzerland-wont...

I am sorry I am pasting an article instead of making my own point but the fact remains that just because it's Switzerland doesn't meant it's any better.

is this article written with a US person being the one storing their mail?

Because as a non US citizen, not having to touch US providers is quite a big plus in my book.

Yea. The U.S. has pretty strong speech and search protection for their citizens, but those don't extend to non-citizens.

Proton mail has an office in SF