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.
Yeah, not for much longer though: https://keepandroidopen.org/
Google is making it increasingly difficult to freely install software from app stores that they don't control and tax. Quoting https://keepandroidopen.org :
> Starting in 2027*, a silent update, nonconsensually pushed by Google, will block every Android app whose developer hasn't registered with Google, signed their contract, paid up, and handed over government ID.
> Every app and every device, worldwide, with no opt-out.
But not for long. Sideloading is being frowned upon by the mighty G
When do we stop this instinctive response of "well you can still do it in an only slightly convoluted way" everytime a corporate does something bad.
Windows added ads - well you can disable them, if you don't like it.
Chrome brought up mv3 - well you can still use mv2, it is only optional.
Reddit locking subreddits behind login wall - well there's always old.reddit
Android moving everything to playstore - there's always FDroid.
How many of these are still true and for how long?
If someone's country is a dictatorship, it doesn't help to tell them that there are 100 other democratic countries, just move. Not everyone can emigrate or want to emigrate for any number of reasons.