Bridges make great venues for collecting a tax.  They are a bottleneck. As soon as people find a route around that bottleneck then your power to collect the tax weakens.  Income taxes, for example, work only because firms have rich accounting systems that it would be hard for them to route around just to avoid the taxation.  Of course the rich can route around them.

As technology changes the bottlenecks move around; and tax collectors slowly follow along behind.  Slowly because people don’t like taxes, but inevitably because people dislike the absense of government a lot more.

So the question arises where in a highly globalized information economy are the bottlenecks where taxes might be effectively collected?  At the emerging hubs.  For example a tax on search would work.  A tax on eBay, Amazon, and Windows would work as well.  I’m surprised I didn’t see this before.  What triggered it was it appears that China sold their search franchise.  I don’t think what your seeing there is censorship; it’s about revenue, regulation, and as usual who’s cronies are in favor.  That firewall of theirs looks like a real money maker!