yrjr Some apps make money off ads, and I think lionscribe has been working with the admins on getting the app compatible for flipphones, which means they don't mind. Either way this would fall into the question of stealing intellectual property, which according to most poskim is an issue of hasagas gvul, meaning taking away business from somebody by offering the same thing for cheaper/free (such as copying a music album), however in this case there is no way to get these apps onto flipphones from the playstore, so this was never a market they would make money from, therefore it shouldn't be an issue. This is my opinion, if you're unsure, ask your own rov/ruv/rabbi.
