It may ease your mind if you could track purchases generated by the use of the free version.
Some brainstorming;
You could remove the backup capability [Warning in caps, 'CANNOT BACK UP FREE VERSION'] or put some kind of token [removed when purchase made] in it to track usage. Keep the song number limit.
A popup at the initial loading reiterating the restriction[s]?
A quick start guide pop up when first loaded and, maybe, a link to the forum in [free/paid] apps might help [in the help folder]?
You would still get complaints though, trolls, fanboys, newbies, non-readers, and some authentically dis-satisfied folks.
Maybe you should put 'THIS IS NOT A PLAYER' in the description.
Some brainstorming;
You could remove the backup capability [Warning in caps, 'CANNOT BACK UP FREE VERSION'] or put some kind of token [removed when purchase made] in it to track usage. Keep the song number limit.
A popup at the initial loading reiterating the restriction[s]?
A quick start guide pop up when first loaded and, maybe, a link to the forum in [free/paid] apps might help [in the help folder]?
You would still get complaints though, trolls, fanboys, newbies, non-readers, and some authentically dis-satisfied folks.
Maybe you should put 'THIS IS NOT A PLAYER' in the description.
Dell Latitude 13.5" 2-in-1 Ubuntu/Win 11
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12
Samsung Note Pro SM-P900 12.2 Android 5.0.2
Samsung S7+, Android 12