[bandergirl]

That’s false. iOS has had full-fledged extensions for years now. Nothing stops uBO from existing on Safari other than stubbornness.

Most serious iOS content blockers ship both a native list (or multiple) and an active counterpart, usually focusing on YouTube ads.

However I am aware that adblocking is still poor on Safari, maybe nobody just can match uBO

[Nextgrid]

You are mistaken. Safari removed the APIs necessary for an uBlock port (there used to be one), see https://github.com/el1t/uBlock-Safari/issues/158.

Injecting code via Web Extensions is too late for reliable blocking - by then, either the malicious JS you are trying to defuse has already ran (if it wasn't blocked declaratively), or if not then the rest of the page's JS depending on it has already exploded and "fixing" it after the fact (by substituting a neutered shim via Web Extensions) doesn't fix the rest of the page.