This is the 21st century. There's no need to put yourself in physical danger by entering the country you wish to spy upon. Everything is done electronically.
I prefer to think that everyone should always question everything I say, and independently verify my claims with their own trusted sources. Then, if they find contradictory information, they are free to share it, so that I might possibly disabuse myself of my prior misconceptions. (As you see, I also have need for wishes.)
Of course, if you have actual research funding for me, that's a different story. I'll give you as much evidence as you can afford.
Talk is cheap, and proof will cost you. If you want evidence, you might have to grab a shovel and start digging.
Workers in foreign countries and spying in those countries are not necessarily related in any way, aside from the occasional discount windfall that states get from assets with the right sense of patriotism, personal weakness, or political alignment.
There isn't really a trade happening there. The Chinese spying hurts everyone who is not a state-owned copycat company, regardless of their country of origin. The American spying hurts everyone who conducts business over the Internet or travels internationally. The ordinary Chinese people and American people get screwed both ways, because they're unimportant nobodies to the superpower state actors. So let's not get all defensive and start pointing fingers at each other, ok?
Neither the companies nor the Chinese engineers profit from this arrangement.
They are smart enough to make spying into a profitable business instead of just a mechanism to move tax dollars to the right people. And with respect to using it as a tool of oppression, we simply don't have anything new to teach them, as they just don't need to know anything about FISA courts or parallel construction.