I like privacy, but a service that's focused on maximum possible privacy for its users paints a target on its back for any three-letter agency, as it will attract a large contingent of unsavoury people.

I just onboarded and was dumbfounded that they do not allow for proper calendar exposure other than a fully public link! The claim of zero knowledge is super cute, for those that need it, but I need a provider which allows me to integrate the calendar elsewhere, as those will not magically move into Proton. I guess I am not in their target market.