I really don't understand this fear about a single pillar of failure, as people were in tears about the Ghostty thread yesterday. git is not GitHub. git is not HTTP. git is inherently decentralized with no concept of client/server. In git there is only local and a plurality of remotes.
That said the solution is simple. Open a secondary, or a new primary, account with another provider and add it to your project's list of remotes. Here:
git remote add <name here> <URI>
Boom, problem solved: do it yourself redundancy/decentralization. If you want to make this federated then write a file containing a variety of remotes per addressed location and a script to dynamically update git according to your catalog at every location.