But the majority mobile OS, Android, allows this already, and always has. There is only one player that controls its own app store, Apple, with about 20% of the market (Less in 20q1 but that’s a special case).

Seems like phone buyers are voting with their feet so why would such a law be required?

Mkt share numbers from https://www.counterpointresearch.com/global-smartphone-share... or https://www.statista.com/statistics/216459/global-market-sha...