I always think twice when a company offers me an "app" for an application that is already available as a web app or that is already inbuilt in the system or doesn't use existing standards. Like, I perfectly understand the need for a Proton Mail client as some would like offline access to their mail and a backup of their mail in their system. But I resent the need of a custom and locked-in app, instead of the service being available over existing POP3 / IMAP protocol. (Yes, I understand how email encryption creates hurdles of using it over POP3 / IMAP, usage, but it would be a lot easier to trust a company if they actually built an extension over existing protocol or create a new standard that makes it easy to access their service. E.g. <a href="https://fastmail.blog/open-technologies/jmap-new-email-open-standard/" rel="nofollow">https://fastmail.blog/open-technologies/jmap-new-email-open-...</a> ). ProtonVPN app also seems a bit redundant when most OSes already have built in support for VPN. Though I understand that it does make configuring, changing / choosing VPN servers a lot simpler, and probably helps ProtonVPN in load balancing, it provides more avenues for data collection and data leak.