I have uBlock Origin Lite for Safari [1] on all iOS and iPadOS devices in my household. No one complains about ads anymore.

1. https://apps.apple.com/us/app/ublock-origin-lite/id674534269...

Your answer is Vivaldi, it has a built-in ad blocker that in my few years experience works exactly the same as ubo out of the box. If it wasn't for Vivaldi, I wouldn't buy an iPad because of what you described.

DNS-based blocking is the way (possibly via conditional VPN if you can tolerate the minimal latency bump).

You might try wBlock:

https://github.com/0xCUB3/wBlock

After having tried Firefox with UBO on Android, I can’t say I noticed any difference compared to Orion on iOS.

You can get Wipr 2 for iOS and (for me) it's been as good as uBO.

Doesn’t AdGuard work?