"Radicle is an open source, peer-to-peer code collaboration stack built on Git. Unlike centralized code hosting platforms, there is no single entity controlling the network. Repositories are replicated across peers in a decentralized manner, and users are in full control of their data and workflow."
From this, I can't tell how it's any different to just plain self-hosted Git. A well written introduction should tell the reader immediately what the software actually does. If it's meant to be an alternative to something like gitea / forgejo then say that, with a brief summary of features that build on top of Git.