[read_if_gay_]

The difference is none of the companies you listed have the same amount of control over the internet. SV giants are the new gatekeepers of information.

[userbinator]

Exactly. Those companies are more of a "you buy things from them" than the "your knowledge and view of the world is filtered through it" of Google. Google yields tremendous power over people just by what results it shows them when they search for things.

[mike00632]

But a better alternative to measure power could be lobbying efforts and spending, which the tech companies are lagging in.