I lived in China. Can confirm I was not a slave, at least not in the sense that America had black slaves.
That is them deciding for you what you can and can't do. If you're not Chinese citizen then it's your choice being there. But if you're a Chinese citizen then all choices are made for you, what qualifies you as a slave.
Slavery is not about hard work or poor conditions. There were plenty free men who had it harder and some slaves that led cushy life.
Slavery is about not being a master for yourself.
Truth. There is a difference between privilege and power. When it comes down to it, we are all only slaves or free by degrees in this world. This world, as it is legally formulated, pretty much codifies Mao's observation that all power comes out of the end of a gun. This is not an exaggeration. It's literally how international law works.
Which is the same that the west does (they just call it "copyright laws").