The tech/demand for the glasses didn't break through some threshold it hadn't reached before, all of the sudden. They became viable as a product again because real training data is more valuable now than ever.
Of course they did, in what world would they not have? You can't get any of these companies to take a single person-minute to look at an issue that affects you. However no problem putting a small country of people to work invading, reviewing, and annotating the shit out of your privacy.
