@nprofile1q... Not sure that Proton’s 100% true statement - that they only respond to requests from the Swiss authorities - is “intentionally misleading”. As you have outlined, it is literally the truth.
We’re all aware that international treaties exist. But, as you also outline, they are subject to domestic law. And that isn’t a given - breaking US tax law is unlikely to have any impact on Swiss authorities, who would likely deny requests for assistance before it ever reaches Proton.
I don’t like Proton much as a company - they do too many things, for one. I don’t use them (any more). But I don’t think your attempt to deliberately stir up FUD about them is warranted here.