Just to reiterate from the OP, there are some apps on both stores that aren't necessarily called "MangaDex" but use us as sources for content. If it's free, we're mostly ok with that. If it is a "premium app" (meaning you have to pay to download. I know that seems obvious but not everyone is aware) or is free to download but the actual content from MangaDex is behind a paywall, that is absolutely not ok and we'll try to warn users whenever we come across such apps.