I didn't use adblock on my phone until recently because until Brave came out, it was such a pain in the ass (root, vpn, etc). But eventually I couldn't take it anymore. I got regular reminders of how badly ads have ruined the modern web. Any small to midsize blog had a 1-in-4 chance of crashing the browser with fake "YOUR PHONE HAS A VIRUS" ads that pull you right out of what you were reading. Extremely irritating and it's no shock to me why Brave was conceptualised.
Did just that for a long time but recently switched to brave. Chromium just feels way more snappier on Android and I prefer its UI much more over Firefox which does many things that annoy me (e.g. ignoring theme-color tags).
iOS has a built in “content blocking” framework. Third party Ad blockers basically submit blocking rules to iOS in JSON format and the ad blockers work both in Safari and in apps that use the newest WebView.
The advantage is that the third party ad blockers aren’t able to intercept your web browsing directly and can’t invade your privacy.