Open-data requirements could make it clearer who is providing a valuable service and who is primarily exploiting information asymmetries between creators and services. They could help identify the genuine rip-offs that thrive on opacity, such as the chronic underpayment of artists or the role of concert organizers in ticket black markets. They could help answer the perennial question of whether streaming payments and other licensing schemes are fair to artists, based not on a notional “value gap” but on who else is getting a cut.

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