Aside from it being made by Google, it supports a monoculture/monopoly in browsing. We've been down the path before. It isn't good. Even if you are using Brave, you are still supporting the Blink monopoly.
https://www.youtube.com/watch?v=eA8O97U1Pbc but also the "crypto crap" is very controversial, and settings are not synced properly when using Brave sync? For some reason, when I had to distrohop and I had my settings synced, I never got the crypto crap disabled automatically. And I had to redo a lot of my front page settings, every. single. time.
That's what I don't like about it. But my opinion is my own, and I myself use Vivaldi because I'm a customisation freak and Firefox doesn't cut it for me.