How do you arrive at that conclusion? They could feed private repos into copilot. It might make copilot better. It's certainly useful to automate extraction of

How do you arrive at that conclusion? They could feed private repos into copilot. It might make copilot better. It's certainly useful to automate extraction of IP with plausible deniability. If someone notices, they can claim "oh that must be in a public dataset as well".