I would not characterize Big Tech use of H1B as abuse. They use it because it provides highly qualified staff that are sticky: people can't switch firms without losing their place in line for GC, etc. So H1B has become yet another group with preference for hiring. H1Bs are hired to keep the core systems running while other DEI groups are hired for management and support functions. No surprise that white people are ticked off.

Voting with your wallet only works in competitive markets. The vast majority of what you use day-to-day have been monopolized so you don't really have a choice.