Whose fault is that? The workers or the boss exploiting their labour?

I can't fault some poor person from another country for coming to the US to try to make a better living than they could where they came from. If I were in their position, I might very well do the same.

I can fault big corporations for not only screwing over US workers by using foreign labor to drive wages down, but for also screwing over foreign laborers by paying them substandard wages and using work visas as a way to hold them over a barrel. Greedy fucks.

Sorry, but that it is absolute nonsense at best, and dangerous anti-immigrant rhetoric at best. Your edit makes nothing better, and if anything makes your comment more stupid.

People move countries all the same, and most sane businesses believe that diversity in the workforce breeds innovation and more productivity. Many people at Twitter likely joined from transfers from offices all around the world, likely to spend time in the US or to move to a team that better suited their skills. They're now trapped not because they're "wage slaves", but because their visa likely doesn't allow them to move jobs.

If the US were to relax their L1 visa during the layoffs last year and allow people to transfer to a new employer, Twitter would probably be dead today.