In spanish we have two different words: tasa is what you are describing: a tasa is imposed to pay for a specific thing. Whereas an impuesto is a different thing that is simply put in a common account to pay for everything that is public, in whatever way the government sees fit. No need to link source and destination.

Think of it backwards: if we agree that X level of taxes need to be gathered to maintain common good, the government needs to gather it in the least unjust way possible. Taxing internet giants, to europeans, seem mostly just.