Better to send your queries to a single DNS provider (over TLS/HTTPS) rather than spread it out, because now, not one but multiple providers can build your browsing history. As someone who runs a public DNS resolver, I can tell you that it isn't that hard to build user profiles.
If you're running Unbound, might as well recurse DNS queries, instead of upstreaming it. If you are adamant on spreading DNS queries across multiple upstreams; doing so over ODoH and/or Anonymized DNSCrypt is what I'd recommend.
If you're running Unbound, might as well recurse DNS queries, instead of upstreaming it. If you are adamant on spreading DNS queries across multiple upstreams; doing so over ODoH and/or Anonymized DNSCrypt is what I'd recommend.