It’s horrible on mobile. Sites like macobserver are bad. Two videos overlapping, popping in and out, shifting content.

There are really good ad blockers on mobile these days. I use AdGuard for Safari and it's as good as uBlock on desktop Firefox.

I left my iPad deliberately unfiltered to discourage browsing - it's a bedroom device - and it's ridiculously effective. I see a cookie banner with the "legitimate interest" nonsense and I give up.