The old heads out there might remember a time when, rather than everyone using one service provider (ex. for Linux binaries/source), we all mutually agreed to use independently run mirrors closer to us. We sort of had to because of bandwidth and latency limits. But it meant that there were a thousand different people providing the same service. Impossible to censor everyone, everyone shares the load, too many places to hack if you wanted to massively compromise, and the users won.

DNS is harder to do that way because it's hard to have limits on DNS. Perhaps DNS could be adapted with QUIC, to allow fast, encrypted DNS that's easier to rate-limit, and then it'd be easier for average people to run public mirrors with limits.