They should have rushed the stage.
The only way working extreme hours can be sustainable is if the workers are self-driven, in control of their work environment, and believe in what they're building. So that's founders and possibly other early employees. But not a large corporation where most people are probably just a cog in a large machine.
Of course that kind of slavery can be a blessing in a country like China where the other options may be even worse...
But if you want human beings to give a shit about said country, maybe let them spend some time in it. Also look up “diminishing returns”.
China has so much excess labour though, compared to the leverage Western workers had back in the day due to lower numbers.
That with Party control leaves it hard to see how anything like unions could form, or someone like a Sam Parnell could emerge (https://en.wikipedia.org/wiki/Samuel_Duncan_Parnell).