Blockchain

No perfect TradFi equivalent exists, since every shared network in traditional finance is ultimately owned by someone. The SWIFT network comes closest: shared messaging infrastructure that institutions connect to and operate through, governed collectively by its members rather than controlled by one.

GPS. No single company owns the satellite network, but anyone with a receiver can use it, and businesses like Uber and airlines build entire operations on top of it. The infrastructure is open and shared, even though no one controls it centrally.