Yes, I've been using it for a few months now, I love it and it is my daily driver. The ux is very nice. It is also very buggy when a new release comes out though, mostly because I don't think there nightly builds have enough users.
The acceptable use policy is for Mozilla systems, such a pocket or ai tools, it doesn't apply to Firefox (according to a Firefox forum response)
Happens to me excruciatingly frequently on the youtube homepage.