No, I mean an entire EU software ecosystem that can keep the lights on even under extreme sanctions from US (or Russia, or China, but we are in practice mostly dependent on US). You can have your local GitHub mirror, but if projects are forced to stop exporting to and collaborating with EU developers, who in the EU will maintain and further develop the now isolated EU codebases?

It's less than two hundred words long, I promise you it's not going to take very long to read