Good question. The 4 initial bootstrap nodes that I provided (in the README) are all connected to each other. If everyone connects to all of them, we are all basically on the same network instead of on "isolated islands"

"Mainline DHT" is the primary one. It backs magnet links and has resisted censorship for over a decade. Largest most robust group of cooperating computers there is.

You can reliably use it to store arbitrary key-value pairs up to 1kb in in size.

https://en.wikipedia.org/wiki/Mainline_DHT