don't do this please.<p>I run my own gitea instance, and for repos that are in multiple places, I leave a note in the readme as to what the canonical URL is. If someone wants to open a PR or an issue on Github I don't wanna be hostile by having them create another account just to ask a question. Once the patch is merged, it gets pushed on all remotes.<p>If you have a large project with lots of contributors and activity, and you actively want to discourage contributions in the wrong place, you can disable issues or PRs for that one repo.<p>Also, people browse code using GitHub clients, serving an empty Readme is not a good idea to break that behaviour.