Most voiced complaints are (as neutral as possible):

- past CEO personal belief on LGTB rights

- If opted in, blocking ads while showing their own ads as system notification (ads are not being replaced in page)

- hijacking typed-in domains in the address bar by adding their affiliate code on select domains related to crypto (reverted after backslash)

- Tips (using their crypto coin BAT) to Content Creators not using Brave being held indefinitely until withdrawn by Creator (behavior changed after backslash)

and now:

- VPN services being installed automatically if browser has admin rights on Windows.

Edit: I'm just listing what I have been hearing the most on HN.