It's been such an obvious self-own for tech workers not to capitalize on any of the multiple booms they've seen, and unionize.
Also unions are mostly there to allow the lazy low performers to coast. We already have a serious problem of this but making it hard to fire them will make everyone’s life worse.
Pretty sure that short term trends drive it more than long-term visa holder counts.
There's a law that says this?
If there was a union there would be no boom to capitalize on.