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.
Maybe people should be mad about what Facebook or Google do but that stuff doesn't involve taking stuff outside their terms of use.
Maybe Github could try attaching a "we can relicense all your code whenever we want" condition to their hosting but they'd lose all their business.