A large percentage of H1Bs go to "bodyshops", which import workers from abroad to temporarily work at companies that are offshoring their employees. Yes, it's perverse; they are in effect being used to replace American workers, but not explicitly.
https://www.latimes.com/business/hiltzik/la-fi-hiltzik-uc-vi...
Wait
Oh no...
The recent H-1B suspension probably goes too far the other way -- the program needs more safeguards against abuse rather than to be discontinued -- which requires a legislative solution (auctioning off the slots seems promising). But the legislators are apparently too busy flinging their own scat at each other right now because it's an election year. In the meantime it might not be such a bad thing to fail closed rather than fail open, given the effect of the lockdowns on the unemployment rate.