Interesting. "Salty" whale we've got here, huh?
Force them with what exactly, missiles pointed at their mining facilities? And who exactly risks total bankruptcy?
This had nothing to do with Bitcoin and as far as I could gather it was simply an attempt from an exchange to have some profit.
You don't seem to know how UASF works. If Bitmain is still stubborn about not supporting UASF and they keep mining legacy chain, if UASF takes over then they will be mining an useless chain that gets wipped.
So it's on their interest to support UASF if starts gaining more and more traction.