I think I would rather work for a company where they do the right thing, even if it does cause negative consequences.
I understand that you're not convinced that banning ICE from their platform is the right thing, or will even do anything useful around immigration. I don't agree with that point of view, and I expect GH's employees don't either. Ultimately it's up to the company's management to decide who they'd rather to piss off: the US government, or a portion of their own employees.