That's because ublock origin uses an API that is not available on iOS/Safari

If you want to be generous to Apple, they're trying to stop the 90% of trash adblockers like ABP, and great adblockers like UBO are collateral damage.

A cynic would say that's a combination of an admission their app store review process can't catch evildoers; and a cynical result of the fact the app store is plastered in (presumably very profitable) ads.

And I don't know what ABP on iOS does or how it changed but the original extension wasn't trash. Sure, it has that controversial "acceptable ads" policy but it can be disabled by just unchecking a box in the settings once. I took a look at the code, compared it to a "cleaned" extension called AdBlock Edge and there wasn't much that unchecking that box didn't do.

Like most people, I switched to uBlock, then UBO, but performance was the main driver. Unless there ave been some major change ABP still fit my needs, UBO is better for me but it doesn't mean the other is trash.

I use Adguard. It has a customized combination of the blocking lists you know from desktop browsers. Trust doesn’t really matter all that much—the blocker cannot see what you’re doing in the browser.