Do you think that we should have a standard for for selling assets which exercises "right to use" to large number of people.

For example assets like video games, copyright file for images, illustrator templates, svgs etc. Here on buying a music over iTunes or buying a game over Steam doesn't mean you own the music or game.

Wide acceptance of such standards can lead to emergence of open marketplaces. You can buy music of an open marketplace or even iTunes and play it for no extra cost over Spotify. The chain can act as a prof that you bought a particular music.

Similarly for games, buy on Steam, play anywhere.. Be it PC, online game streaming platforms like GeforceNow, Sony's implementation etc.

Here many assets can be stored on a single contract and singular assets can be owned by many people

Also, the buyers need not be stored on contract storage but as events. Third party integrators can use the open chain as the proof and provide access.