I personally use Timescale magicDNS on all my devices, with pihole DNS running on a home server. The magicDNS can make my home server the 1st responder for DNS queries and it'll block a lot of ad domains.
>>srcrei+(OP)
DoH was designed to prevent the network operators from interfering with or snooping on DNS. The stated purpose was to prevent your carrier or country from seeing which domains you access, and/or blocking you from accessing them. However, it also prevents devices like piHole from passively blocking ad requests as easily.