VFX unionization has been suppressed for decades through a consistent level of FUD and a constant race to the bottom-style system that has been fully supported, encouraged and enforced by the big studio clients.
It’s barely even worth linking that “life after pi” docu-short about Rhythm&Hues at this point, as the same thing has happened again and again since then.
It would be nice if this marks some kind of sea change, but I wouldn’t hold my breath just yet.