[pdimitar]

The only thing keeping me in Dropbox is the fact that I use several very important apps (one of which is an encrypted password vault) across very different OS-es -- think iOS, Android, Windows and macOS.

They offer transparent syncing so all your app instances work with the same data and sadly trying to get the developers of the apps to include self-hosted solutions (with added configuration step: the IP/port) is not happening and isn't likely to happen.

And both Apple and Google aren't open to the idea of allowing cross-ecosystem app synchronization (think game you play for an hour on your iPad but then want to play it on your specialized gaming Android device when you are out and about later; in the case of games this problem is solved by using Google or Facebook as login providers on all your devices). And until that's true then Dropbox and other popular cloud storage providers (mainly Google Drive and OneDrive) will always have a place.