You can get the FFUpdater app from F-Droid, then use that to install Brave to your phone. But at that point, you may as well just use FFUpdater to install the much better alternative, Firefox, which doesn't indirectly support Chromium engine dominance and doesn't have that weird crypto crap Brave has.
Edit: Someone else replied to you suggesting Mull, which is also downloadable through the FFUpdater app.
I don't believe they've had any audits or court cases at any point. Generally, I view it as a bad thing when a VPN company gets taken to court or otherwise involved with the authorities, since it indicates they're in the crosshairs of the government and private lobbying interests, so the fact that they've gone under the radar all these years (they were established in 2010) is a plus in my opinion. I suppose a third party audit wouldn't hurt though.
I still switched to them despite the lack of any audit though because from what I'd read on their about us page, the company was established by privacy activists and hackivists, so that was enough for me to trust them, personally. I tend to trust idealist types over finance-driven entities that run tech companies in the pursuit of profit rather than true ideals like the preservation of a free and open internet. I don't fault you for going for a higher standard than that though, at least when it comes to proof.
Air supports gigabit speeds if you connect through Wireguard (which you should be doing anyway since it's just plain better than OpenVPN)
I'd recommend AirVPN. They offer IPv6 support and port forwarding. Speeds are good too. I switched to them after Mullvad removed port forwarding support and the speeds were consistent.
And wallets
The notification to enable enhanced safe browsing even shows up when you're accessing Gmail on Firefox. It doesn't even make any damn sense, this feature only works on Chrome. And of course they'll never add a "don't show again" option. Think I might just set Gmail to forward to my Proton account from now on.
Edit: found an article on how to forward to ProtonMail in case anyone else wants to know how. Seems very easy to do.
Huh, it never occurred to me to block the notification through uBO. I'll make sure to do that the next time it shows up. Shame I can't use the same method on the Gmail app to make it go away forever.
Reminds me of this song.
At first I thought it was a joke. Then I saw stuff like this, and now this post. Why is this a recurring thing? Is it just some kind of horrible running joke?
Seize the memes of production
Very good choice for a mobile browser based on Firefox. I've been using Iceraven on my phone for some years now and it's definitely better than default mobile Firefox. I'm sure you'll like it.