But the point is, the U.N. can't do this. Ever, barring some seismic shift in the world power dynamic. The US is a veto-power member of the Security Council, which means in practice that anything going against its own monetary interests never passes. That's the way it's effectively always been, and, as Taz mentioned, it has been brought up (and shot down) multiple times before.
I think I understand your basic point regarding the "joiner" thing, and while it's not as big of an issue as you make it out to be (mostly because this proposal will never pass), I can see why putting extra taxes on the internet could make it less accessible.
It is not a government which is entitled by legislation and the consent of the governed
This does not make sense. The UN, however powerless, is a more-or-less democratic body wherein each country gets a vote. If something makes it through most parts of the UN, it's because the majority of countries that are members of that body wanted it to be done. On the security council, the US is even significantly over
represented, having permanent veto power where other countries do not. Now, granted, votes aren't assigned based on population
, but that's the way it works in the US Senate and- to a lesser extent- the Electoral College.