DNS is distributed, by design. Your ISP operates no differently than Cloudflare, and receives routing information from peers in the exact same way. There is nothing special or unique about consumer ISP-provided DNS. A DNS provider is either the definitive source and the buck stops there for a lookup, or it forwards to a peer for resolution.

Cloudflare is not a telecom, which comes with regulation baggage that can be enforced. This matters a lot to a subpoena.