M.int

This one is open source.
Adguard is an massive contributor in the adblock scene.
Many of their products are free (Adguard Home, DNS, etc.). Even this one has a free version. They want to make money as a company and on iOS you gotta pay the Apple tax.

But you can install Adblock extensions (but only in Safari)!
The best by far is Adguard.

Do you use the paid version of Adguard?
For me on iOS it’s almost as good as uBO on Firefox.
No blank spaces where ads go, support for every filterlist I want, especially nice for blocking cookie notices.