Microsoft doing dumb things once again.

Who in their right mind will opt into sharing their code for training? Absolutely nobody. This is just a dark pattern.

Btw, even if disabled, I have zero confidence they are not already training on our data.

I would also recommend to sprinkle copyright noticed all over the place and change the license of every file, just in case they have some sanity checks before your data gets consumed - just to be sure.