> Google, Facebook, Microsoft and Apple would be extraordinarily profitable even if they were paying 26% corporate income tax rates. Your entire premise collapses right there.
You are flat wrong. The integration has already occurred. The corruption is currently ingrained. Being able to source from your own penny factories in another country put many of the behemoths into their market dominant position or solidified them. Facebook is an odd duck which leveraged capital wisely. Amazon had decades of massive loses (revenue-wise) until, roughly, AWS took off. The capital markets favor bigger players at almost every turn and smaller successful companies are consumed and destroyed at a shocking rate after they rise above a starting locality. Microsoft used to afford that kind of market attrition, but now it's been largely Yahoo, Google, Alibaba, etc.
Facebook will generate near $20 billion in earnings before tax for fiscal 2017. You're positing that if they pay $6 billion in taxes, instead of $4 billion, then their monopoly will unwind or somehow their competitors will finally be able to catch up (yeah, it's just not fair, the tax rate that Snap is paying).
Now apply the exact same thing to the other tech giants (Apple, Microsoft, Google, Oracle, Intel, Cisco, etc). It's just as far-fetched with them as it is Facebook.