It's not just L visa(I was on L a few years back, and returned back).
Let's be honest this is far from what people call slavery. They are being paid multiples of six digit salaries, RSUs and work in one of the most happening tech ecosystems of the world.
I would love to be a part of something like this. Heck most of us would love to be a part of something like.
I kind of envy those guys working on these projects. I hope I was the one there.