Just chiming in from Panic’s perspective and our stance on it, as we have had several users ask if we plan to support this built-in. The short answer is “no.”
The long answer: GitHub Copilot is in very untested legal waters, as it’s potentially trained on code from GPLv3 projects (among other licenses). GitHub and Microsoft’s stance on this is that it’s fair use.
We’re concerned that if a legal challenge were brought up, it could involve anyone who is facilitating the service, which would include us as an IDE builder. While Microsoft and JetBrains have both the financial padding and legal teams to deal with something like that, we definitely don’t, so we really don’t want to take the risk.
This does not mean a third-party couldn’t build an extension for it, it’s just outlining why we likely won’t ever build support in unless something significant changes.