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 it was over-staffed. Unions worked during their heyday because there was a labor shortage, so they had leverage. Bandcamp employees didn't have that leverage.