The Bitcoin protocol is plugging in at the bottom of the internet tech stack. Any valuable part of the legacy internet architecture we want to port over and strangle from the legacy system can be done. Financial services was an obvious first use case. But the bits of information secured by proof-of-work can represent any information.
They are literally just bits of information that are physically costly because the state space in which they "exist" was designed to be small and more physically constrained.