Running a privacy-focused public DNS service is a highly specialized undertaking, and the Quad9 Foundation is the undisputed leader in the field. Rather than duplicating their efforts to achieve only part of what they do, we’re putting those resources toward financially supporting Quad9 instead.
Nextdns.io does, if you just need house level DNS ad blocking.
Technically not free if you exceed a very high number of DNS queries, but ive been using it for years and have never got there.
You can also disable logging entirely, so there is no record of any of your queries if you want to maximize privacy.
ControlD also provides a free DNS service with various lists.