FB is right, they were still pretty unproven in 2010. It took nearly 1.5 years after their IPO before they convinced people they could make money.
I agree, it seems like they would be looking for evidence of undervaluing. But like, let's say you are discount potential cash flows. I don't even know if FB was profitable in 2010, what kind of projected cash flows are you going to have?
I just think that if the governments cared about this so much, they would actually fix this. The double irish is going away, but while the US had a chance to fix stuff in 2018, there's still incentive to offshore IP, and in fact, reinforces the advantage of offshoring production.