Wasn't their entire original premise the Basic Attention Token? It was some kind of crypto that you'd buy and then the browser would block ads for you and instead pay a small amount to the website owners. Problem was if the website owner wasn't part of the program they'd just keep the tokens for themselves, something like that.
OK that does ring a bell. The whole project always seemed a little on the scammy side and I wasn't sure what the browser actually brought to the table that Firefox didn't, so why even check it out?
Much better performance on less powerful hardware (I don't care about synthetic benchmarks, do your own testing and you will notice the difference).
Vertical tabs. Built-in tor support, built-in efficient adblocker that supports ublock origin rules, but is complied into native code.
More anti-tracking and anti-fingerprinting measures (in total, and only counting those enabled out of the box). Configurable shortcuts for absolutely everything. Probably something else I'm forgetting.
Plus a bunch of crypto bullshit, but it's disabled unless you make an effort to enable it.