So… what is happening here? All these people are opting out of having their content recorded as part of a corpus of open source code. And I'll probably do the same, because "The Stack" is falsely implying people have permission to use it for ML training. But this means "The Stack" has put a knife in the heart of publicly archiving open source code at all. Future attempts to preserve OSS code will, if they base themselves on "the stack", not have any of those opted-out repositories to draw from.
Like, heck, how am I *supposed* to rely on my code getting preserved after I lose interest, I die, BitBucket deletes every bit of Mercurial-hosted content it ever hosted, etc? Am I supposed to rely on *Microsoft* to responsibly preserve my work? Holy crud no.
We *want* people to want their code widely mirrored and distributed. That was the reason for the licenses. That was the social contract. But if machine learning means the social contract is dead, why would people want their code mirrored?