Link for opting out: github.com/settings/copilot/features

In the “Privacy” section, set “Allow GitHub to use my data for AI model training” to “Disabled”.

Illusion of choice. That setting will, totally unbeknownst to them, enable itself.
I turned it off ages ago, and if you already had it off, it’s staying off. (for now at least)
You better check again, mine got switched back on.
It seems to be off by default if you’ve already opted out of Copilot entirely. Definitely still a reminder I should set up my own git though
I run mine on a raspberry pi zero - wasn’t terrible to set up.