I personally wouldn’t be against migrating our issue tracker off github in the future, especially once the federated alternatives become more mature. The other code contributers would also need to agree though.
We also have the code mirrored in several places off github.
They do, but also donations are still entirely optional. We’re a soup kitchen providing a free meal; if people don’t want to eat the soup, or eat it but don’t want to (or aren’t able) to support the kitchen, that’s not a problem.