I don't value privacy for the sake of privacy, I value it because it's useful for defending against capitalists and fascists who want an unequal society that commits genocides and incarcerates people for immutable characteristics. Fascists don't value privacy for the sake of privacy either, for them it's a tool to further their goals of creating the worst society possible. It comes down to a left vs right issue, I picked one side, and Proton picked to promote the other.
I'm not sure how Brave is significantly better for fingerprinting than Cromite other than being more popular, which it still isn't popular anyways and both of them can be bypassed with more advanced scripts. Vanadium is the most secure, being part of the GrapheneOS project, but all of the Chromium-based Android browsers have better security than FF-based currently, although I just saw somewhere that IronFox is enabling process isolation which is currently experimental.
For me the main use case for LibreWolf isn't so much being anonymous as it is wanting a browser that doesn't have ads and data mining stuff going on and has some additional privacy protections but that also doesn't get in the way too much in terms of usability. Zen Browser might be a better fit for this use case now since it improves the UI while claiming to not have telemetry, but I haven't tried it yet. I'm not really concerned about fingerprinting since most sites I use already know who I am since I'm logged into them. If I wanted to be really private though I'd use Tor or Mullvad, but not as a daily driver since I value UX more as long as it's not invasive.
On default settings, Firefox's news feed is suspiciously similar to the stuff I browse, so I don't trust it at all for privacy without Arkenfox. I like how LibreWolf strips all of that out by default but still lets me loosen the settings so I can install add-ons and keep data I want stored, which I'm not sure that Mullvad browser does. If it's getting behind on updates though, that would be disappointing, although right now the LW Flatpak is on a newer version of FF than Fedora FF. Mullvad browser is better for anonymity though.
Catering to the "Libertarian" neo-Nazi crowd so they buy your product vs wanting to defend minorities against these sort of people is not the same cause
Also Hexbear and Lemmygrad were populated by r/chapotraphouse and r/GenZedong users respectively when those subreddits got banned, which happened before the main Reddit exodus that populated instances like .world
Nowadays I would recommend Zen Browser + uBO over Brave which has a nice user-friendly UI and supposedly disables telemetry. Before Zen Browser, disabling the crap Brave comes with takes a similar amount of effort as tweaking Librewolf's aggressive privacy settings, but one of them is actually privacy focused and the other is run by a shady ad crypto company with a shady news feed that keeps pushing Fox News and a homophobic CEO. For mobile there's Cromite.
I use a custom domain for basically all emails since I care more about portability than anonymity. Each account gets its own address, and if a site gets hacked and I start getting spam then I know which one it was. If I really wanted anonymity for something then I would use a randomly generated masked email.
It's not E2E encrypted unless you're using PGP or emailing another Proton user, which is basically nobody for most people. They do encrypt your email when it arrives in a way that is supposed to make them inaccessible to them (which is more than what most email providers do), so you'd need to trust that they're not intercepting your emails and storing them somewhere unencrypted. Stuff like SimpleX/Cwtch/Signal is E2E encrypted though by default so their security is a lot better
I was on a trip for a few weeks to visit family, and just a few days after I got there my server went down and I lost access to all my stuff (I'm about to fix it when I return tomorrow). Stuff like that is why I will never self-host something as critical as email
I don't value privacy for the sake of privacy, I value it because it's useful for defending against capitalists and fascists who want an unequal society that commits genocides and incarcerates people for immutable characteristics. Fascists don't value privacy for the sake of privacy either, for them it's a tool to further their goals of creating the worst society possible. It comes down to a left vs right issue, I picked one side, and Proton picked to promote the other.