The irony of it all is that their code will find its way into the next Common Crawl release anyway and that's used to train GPT-3, which in turn forms the basis

The irony of it all is that their code will find its way into the next Common Crawl release anyway and that's used to train GPT-3, which in turn forms the basis of OpenAI Codex, which is the product that CoPilot builds on... So hosting elsewhere might not safe your code from ending up deep in the bowels of some corporate black-box ML model that occasionally regurgitates your IP if accidentally given the wrong (right?) prompt. If you make your code public, you basically accept that someone will copy it verbatim. Other companies still might have it in their closed source product somewhere, even if it's just accidental copypasta from SO.