Their developer blog goes further: "But for those who already have an app on Google Play that requires technical work to integrate our billing system, we do no

Their developer blog goes further: "But for those who already have an app on Google Play that requires technical work to integrate our billing system, we do not want to unduly disrupt their roadmaps and are giving a year (until September 30, 2021) to complete any needed updates." This means Netflix, Spotify, and even Apple have a year to find another solution / store.