I just immediately think about the Opera GX ads I’ve seen in youtube videos; it’s perhaps a bit likely that the browser that’s advertised aggressively will also aggressively advertise.

I’m personally sympathetic to the lack of diversity in rendering engines, which makes any Chromium browser a no-go in my case. (iOS sucks; Apple still requires all iOS browsers to use WebKit, as far as I know.) Fortunately, LibreWolf is still actively maintained.