What if the legislation required that content platforms provide an API that adhered to an open standard? Such that there could be open source clients that unify them all (not just janky ones that do their best to not break with every platform update), so that consumers can have their libraries in one place, and still browse all store deals in one place.

Ideally the legislation would also extend to all content including music, shows, movies, and internet content/streams, so that we don't have to have separate apps for Netflix, and Hulu, and Amazon, and HBO, and Roku, etc.