One of the things that bugs me about PiHole is that it doesn’t block YouTube ads. Well I’ve found a partial fix. If you go to: settings / DNS and change the ipv4 upstream DNS server to custom with the IP 94.140.14.14 and 94.140.15.15 you’ll be using AdGuards DNS server and that does block YouTube ads, not all of them but it does seem to reduce the problem. AdGuard advertise this feature on their website so they are obviously happy for people to use it.