Google pays Mozilla to exist. I wouldn't be surprised if other browsers get either checks or favors for existing. All of this is to make Google not seem like the monopoly it is.
I use Firefox as a daily driver in both desktop and mobile and have zero issues.
Hell, chromium can do everything chrome can.
Maybe they're a monopoly in the online advertising space but I'd argue that's simply because they're better.
Safari is a contender on phones, not so much on desktop.
It's not Google's fault people prefer chrome over safari. The fact that people _can_ choose Chrome, Safari, Firefox, Chromium, Brave, etc. is what matters. As long as Google isn't doing anything anti-competitive, it's absolutely okay to dominate the market with a superior product.