It sounds really stupid, I use ZFS on FreeBSD which I don't believe is supported and on Windows I use EFS and Bitlocker with OneDrive for Business since one of my employers provides it so I don't particularly care, but it sounds like simple incompetence, like Dropbox laid off too many developers and the ones they have left aren't good enough to support more than one filesystem, and a basic one at that.
Thing is, its really short sighted, encrypted filesystems are already much more the norm rather than the exception anymore which is only increasing in terms of market share, and they're artificially cutting off their potential users.
Oh well. Sucks for them I guess.
Biting the hand that feeds IT
