Why not just have immigrants, who come to the US as free and full citizens, at liberty to decide on a job in response to personal preferences and market signals

Why not just have immigrants, who come to the US as free and full citizens, at liberty to decide on a job in response to personal preferences and market signals? If that means going to med school or becoming a florist instead of working in the valley as a dev, that's the market's answer. This whole notion that there's a "shortage" because people won't do this at a price Oracle has decided is reasonable is astonishing to me. About 1.2 million immigrants come to the US every year. Unfortunately, these free folk don't appear to want to become devs in the valley at the rate Oracle thinks they should, any more than the people born in the US. The problem is that immigration slots in the US are generally based on family reunification, and don't come close to meeting demand. But a bug can always be a feature. I think tech companies like this. It creates scarcity, which makes their control over one of the few avenues into the US very lucrative. They can use this to ensure that would-be immigrants are not in fact able to participate freely in labor markets, but are beholden to corporations for their right to stay in the US and not be deported.