This is interesting but the problem that I see with this argument is that you are ignoring transfer pricing agreements. Basically companies like Twitter (and google, facebook, etc.) use a bunch of complex tax structures in different countries to legally avoid paying corporate income tax. Google paid something like a 2.6% effective tax rate. Others like GE paid a negative percentage.
So the issue here is that in the case of google or any major tech company investors + company only pay the 15% + marginal effective rate of 1 or 2% which is only 17%.
So the issue here is that in the case of google or any major tech company investors + company only pay the 15% + marginal effective rate of 1 or 2% which is only 17%.