Comment by brainwad

You can install from other stores (AnkiDroid is on F-Droid, for example), or from direct file download on Android already. The problem is rather thay most users just use the store preinstalled on their phone as part of Google's deal with OEMs to bundle Google Play Services. So either you follow Google's rules, or you lose all the users who don't want to leave the walled garden, even though they can.