If governments want to effectively tax the largest players, they would need to take up arms against those companies and spill some blood. Or at least grab a few top level executives and put a gun to their head and lock them in a cage. Do you see that happening? Of course not, it sounds entirely insane. And the executives know that. For them, however, the true sociopaths who rise to the top because they are willing to do literally any thing short of slitting their own throat in order to be at the top, a gun in the face is the sole thing they will listen to. When they accept that as their standard of having their behavior changed in a room full of people not bankrupt enough to pull a trigger? They don't have a single thing to worry about.

Those who fail to learn from history will be doomed to repeat it. All the things you really wish to cry out "but no one would DO that"... can you really not think of any examples from history where it already has been done? And on smaller scales even? Why would someone now not be willing to do it for much higher stakes?