I feel like it's probably not a high priority, but the company I worked at that selfhosted gitlab was also paranoid about dependencies disappearing and so mirrored every repo they had a dep on.
I imagine that's not that rare of a situation and it would have been a nice qol kinda thing if we could have federated with the upstream and gotten a backup of issues and such and could do everything on the one platform. definitely not important and requires upstream to also federate, which will never happen for github so not important
it doesn't matter how it was made once it's secondhand since it doesn't support the manufacturer
I suppose there's people that bought the original item since it had resale value, but I really doubt that's significant overall, especially at most thrift stores