Sometimes better search results than DDG (but about the same), EU based (France), offers a Openstreetmap based alternative to google maps (opposed to ddg using Apple Maps) and a slightly worse privacy policy are the main differences

Anyone know the title?

Definitively going to be useful. I’m just wondering if this will work with extensions like Adblock or Dark Reader?

That heavily depends. Brave may have better advice/tracker blocking by default, but they send more telemetry. Them being an advertising company also doesn’t speak for them. Brave is a decent browser and on IOS/IPadOS a good option for open source + Adblock, but max privacy would be reconfigured Firefox or Librewolf.

Privacy, Customization, better for Adblock. Or just to have a alternative if you’re main browser fails

The OS part is open source, the Steam part isn’t. This is also true for Chimera OS and similar distros