It wasn't taken down by Github, it was seemingly taken down by the maintainers. Git already provides protection against this via local copies, so there's no benefit.

Not familiar with the first but the second is funded by a commercial company whose core focus is Ethereum-based, and they're making another cryptocurrency and caused a bunch of PR spammers the same way Tea did.

https://radicle.xyz/faq https://docs.radworks.org/#projects https://www.drips.network/