Even if you see it as China enslaving its own citizens under false pretences of criminality, that's still quite different from private entities in one country luring people from another country under the false pretences of high-paying jobs and then enslaving them.
Yes, there are differences. But there are also some pretty worrisome similarities. And the numbers in the US are far higher than those mentioned in TFA, especially when taken over the decades that this has been happening.
The difference is that the US is a democracy and people voted for the politicians who created those laws (and the attorney generals who enforce them), so by democratic logic the people convicted by the system "deserve" to be imprisoned to some degree.
Sometimes it's not even the majority. Politicians are elected for their main policies that usually involve a couple things, but there are thousands of laws and it doesn't follow that every one of them has majority support.
It's also a matter of inertia to "overthrow" the government in power. In democracies there's a peaceful way to do this, and in autocracies there isn't. The fact that autocratic governments aren't yet toppled does mean something, though obviously not much. But then, the fact that the government is democratically elected doesn't necessarily mean much either. (You sure Americans like Trump?)
While that may be true, surely philosophically speaking there's a significant, qualitative difference between saying "this is moral because people voted for it" and saying "this is moral because the stupid victims deserved it". Many people would accept the former, accept that prison labour is morally justified, but very few people would accept that it's morally okay for private criminal gangs to kidnap and enslave people.
Philosophically speaking, from the perspective of a victim it's all the same. They don't have the luxury of being able to philosophize about it, they are too busy dealing with the reality of it.
