Comment by kemiller

Black markets exist, but they pay a different sort of tax: the muscle and violent losses required to keep their property. Lawful governments do that better, and that’s what taxes pay for. Google and Facebook have access to the legal system in France, not to mention the wires that run the internet itself. You can argue about what the optimal taxation scheme is but arguing that it’s not necessary, or that the internet is somehow special, is tiresome.