Syncthing is not a hosted service, rather its a p2p way to sync files and other things between your devices. It relies on the bittorrent protocol, so you don't

Syncthing is not a hosted service, rather its a p2p way to sync files and other things between your devices. It relies on the bittorrent protocol, so you don't need to have a central server. What you can do though, is install it on a NAS as well, so that files are also synced to a central location.