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Block the google, cloudflare ones - will cover most situations. Or white-list egress IPs for your unknown devices if you have to use them. Or setup a transparent proxy and inspect the content there and deny DNS. There ARE ways but yes things get a bit more complex. Most firewalls will be happy to index a long list of IPs as a set and perform well checking if src/dst ip matches. So you can use sites like https://github.com/dnscrypt/dnscrypt-resolvers to extract the list of IPs and update the set.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.