I get the impression there's an attitude from the newer generation of tech workers--the ones that are more progressive and less libertarian--about their right to unionize. They were so interested in union politics and the reading about the glory days of unions that they overlooked their current situation. You don't sell a company to break up a union and lay off half the staff. Bandcamp wasn't a good fit any more, and…
Besides, unemployment is low, so I'm not sure why you're talking about there not being a labour shortage.