People use it because it is essentially Chrome with uBlock-Origin built in (I think the developer of uBlock Origin is employed by Brave) and it removes the stupid cookie modals that are on every website. Between running a pi-hole and Brave, I rarely see an advert on a website.

Turning off the "crypto-crap" can be done quite easily (you literally right click on the BAT icon and it is gone) and the new tab ads are removed again with a couple of clicks. I've found it also runs much better than Firefox on older hardware.