

being shaken down by Proton to pay even more money
Obviously you’re free to do as you please and its not an airport, you don’t have to announce your departure. But there’s no such thing as free service. Posting angry tirades seems counter productive.
I’d recommend self-hosting. Then you don’t have to worry about privacy, getting data hijacked or getting ripped off by sudden cost increases.

Yes, it’s by design. You should probably read this https://mullvad.net/en/browser/mullvad-browser