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> Has this been verified by an independent third party?

Which would that be? ;-)

I use ProtonMail myself. I kind of doubt that all their promises are true. But at least it's an entity separate from Google. A few years ago my whole Internet life somehow went through Google, from Search over Mail up to News, Discussions, Drive, YouTube... I find it creepy that when I click an article in an online shop, not even buying it, a stupid ad of it might appear for a week. Even if you agree that ads have a purpose, there is no purpose for showing me an ad for a thing that I looked at myself already!

I have no indication of ProtonMail doing anything in this direction (I see their ads only on protonmail.com), that's reason enough for me already. Also I trust them that their servers are not going to be hacked so that those contents will land on troyhunt.com.