Why not improve upon https://radicle.xyz? It's been running for a while now with promising future. From my naive understanding of running a radicle node, it consumes around 40G of storage for the current network of 5k repos
The social factor. As someone who is very active on Bluesky, the social inertia of Tangled is great. I like Radicle too, but it's harder to collaborate with people, because it's harder to sell to people.