I guess that when Apple, Google and Microsoft are giving away their browsers it makes sense for 3rd-party browsers to look wherever possible for revenue streams.
A few weeks ago Firefox introduced its own VPN, actually a rebranding of the highly-regarded Mullvad VPN. Same$4.99/€5 price as Mullvad though.
And today Brave announced its own VPN, for $9.99 per month or $99.99 per year, for up to 5 devices, available as an IAP, and built into its iPhone/iPad browsers too.
It’s powered by Guardian, which I’m not familiar with, but they apparently made a splash a year ago as a privacy firewall-VPN which routes all the network connections from your iPhone or iPad through their VPN, then filters trackers on Guardian’s servers. Gruber approvingly wrote about Guardian last year, and Glenn Fleishman (MacWorld, TidBits, various podcasts) wrote about them for a FAST COMPANY article.
Neither service is cheap - a couple of years ago I grabbed a $90 deal for three years of PrivateInternetAccess (which I’ll give a B+ to), but the idea of stripping out trackers could be really interesting if it includes trackers in emails.