What do you use as an alternative to Dropbox? I haven't found anything that works as well across multiple platforms. I really hate all the feature bloat in it, which I never use, and weird decisions like dropping non-ext4. But still, for basic file syncing it seems hard to beat.
Sadly Linux users are like 1% of the market, non-ext4 is even less (and I am a full-time Linux user and big ZFS fan). They actually restored support for several non-ext4 filesystems over a year ago[1].
Syncdocs has been working reliably for me for years. They seem to focus on the core file-syncing stuff, which works fast and reliably, rather than blingy features.
I loved Tresorit but it's camera upload feature didn't transfer files correctly from my wife's iPhone - it left them corrupted and unopenable with no warnings or errors whatsoever.
Unfortunately because of that alone I dropped them completely. I'm using Dropbox now because I haven't found a better alternative for syncing between iPhone/Android/Windows/Linux.
The others are generally not supported on Linux. Dropbox has a cli client here that mostly works. At least if we are talking Google/Microsoft. Or the companies are small enough to go under overnight and leave me in a lurch
There is a difference between official and unofficial support. Also, Dropbox is big enough to be around for a while, but this is their product and if it goes south, so do they. I don't trust Google to maintain any product before rebranding, pushing the work to the users, or dropping the product. They have shown otherwise.
Syncthing is solid. Maybe a little too geeky for most, but for tech-minded people it can really work. I've had little issues here and there, but it definitely solves some problems for me.
I generally use Dropbox for personal files and Syncthing for business. It's a great setup to keep those things separate.
