Every node you’ve ever talked gets cached.

Fresh installs can bootstrap:

- BEP-34 DNS seeds (TXT records listing live router IPs).

- Magnet links with explicit peers.

- Local peer exchange / LAN multicast.

- Manual seed lists shipped in the app (same trick Bitcoin Core uses).

Removing all these vectors simultaneously would require blanket UDP filtering across the Internet, which is a lot harder than blocking a handful of Nostr HTTP relays.