There are no labor shortages. It’s a way for large tech companies to control salaries of the skilled workers. It allows to lobby the notions of need for worker

There are no labor shortages. It’s a way for large tech companies to control salaries of the skilled workers. It allows to lobby the notions of need for workers’ visas to bring in cheap labor. This cheap labor is then much more easily controlled (visa conditions, e.g. H1B - cannot easily leave workplace, several years to transition to next immigration status, yet more years to citizenship).