Built-in economics doesn't mean users pay per use. A popular design path is to try to build systems where data that goes on the blockchain is very limited[1] and easily subsidized. It's also very easy to design systems where data writes and computation are subsidized by clients or the system itself.[2],[3],[4]
The reality is that in current networks, which are totally financial but only implicitly and in a way that is opaque to most users, computation and data costs are still subsidized. Crypto networks open a huge design space that simply makes the economic flows explicit — and not necessarily borne by users.