>One -- Open Camera -- does have the ability to make such a donation by purchasing a separate "donation app". Android has the concept of 'unlock keys', which w

>One -- Open Camera -- does have the ability to make such a donation by purchasing a separate "donation app". Android has the concept of 'unlock keys', which were basically IAPs for full unlocks. I'm pretty sure you can still make them, as a couple apps I use still have legacy keys in addition to IAPs (added later). The guarantee that you're only paying once is a nice thing, but these days I think users understand IAPs these days and prefer what they know.