Nothing is free people! ... People are outraged by GitHub but nobody is going after Facebook or Google for training their AIs on your personal data. Facebook used your face to train some algos, google your personal emails etc.
A lot of people dislike them and minimize their use.
More importantly, we are seeing a bait-and-switch. People agreed on GitHub storing, showing and indexing their code and issues, not using the code for Copilot, regardless of what the fine print in the usage agreement says.