The best thing about Syncthing is that it does not require accounts! With iCloud and Dropbox (and SaaS in general), everything is linked to your user account. They assume that each computer is used by exactly one user. But that just doesn't match my reality! At home we have a shared computer in the living room, and at work we have build servers shared by multiple people. I really don't want to sign in with my persona…
It's not so much that they assume it.. they leave that feature out deliberately so they can up-sell you to 'Dropbox Family' or 'Dropbox Business'. This is a great example of the commercial incentives for Dropbox degrading the user experience.