Peer to peer sharing doesn't really have much opportunity for commercialization. The closest thing I can think of is bluetooth file sharing, which can still be a painful experience in some circumstances
Yes businesses tend to only work on interoperability when the interoperable product is just a complement to their main revenue generator. Like how Netflix releases clients for many platforms. No one is going to be motivated to make a (1) free (2) easy to use (3) cross platform file sharing solution. It'll also draw the ire of the copyright cartel. File locker websites have been harassed and "legitimate" cloud storage services are forced to police their user's files.
