Radicle gives a decentralised Git network that is much more immune to any legal action.
This makes it much more difficult for Nintendo to take such action. Because it is a civil dispute, not a criminal one, the trick is to make it more costly for Nintendo to abuse the legal system (it is unlikely the legal system abuse will be fixed in long term, or ever). When DMCA and such laws were designed, it is unlikely the lawmakers intended it to be abused like this. There is no penalty for Nintendo to do as many takedown notes they want, whileas there is a headache for anyone involved in these projects to defend themselves.