Privacy

Um...obviously, yeah? The alternative to complying with the authorities is to challenge it in court, which is extremely expensive. The important question is not how much information they do hand over, but how much information they have themselves. For example, if your keys are private, proton has nothing useful to share. This is why end-to-end encryption matters, the only avenue to real privacy is to make sure Proton has nothing useful to share. They're not going to host their servers on international waters.