I always figured there were a lot of poorly-secured Firebase apps out there. My experience with Firebase Database is that it's great for apps with extremely si

I always figured there were a lot of poorly-secured Firebase apps out there. My experience with Firebase Database is that it's great for apps with extremely simple models, or for PoCs where security and performance aren't a concern. If each user's data is independent and isolated, then it's not a problem. But for more complex cases, e.g. two particular users can see a piece of data because they belong to the same group, the complexity of trying to properly secure the database isn't worth whatever efficiencies you would gain over using a more traditional database. However, if your goal is to create an offline-capable app, then there aren't necessarily going to be any simple alternatives. CouchDB is good for offline but doesn't necessarily solve security.