Could try a VPN - this is one of the few things that also works on ios. The Mullvad vpn app on iOS gives a decent experience and can block ads though not always successful.
It's not really comparable to a pi-hole in that you get no control over it but it's trivial to set up and get going with it and also works when you're travelling.
It's not really comparable to a pi-hole in that you get no control over it but it's trivial to set up and get going with it and also works when you're travelling.