Radicle isn't unstoppable at all and not fully P2P, it relies on centralized shit.
That's what Project Zymogen is trying to fix, making Radicle truly P2P / "unstoppable"
https://bounties.monero.social/posts/207/6-282m-the-github-cure-radicle-p2p-tor-nostr-monero-project-zymogen
