This can sync any folder and (presumably) can have multiple instances running; Dropbox is limited to a single instance per user syncing ~/Dropbox. This is P2P and works without an internet connection.
It seems to be built for a different use case; Nextcloud (server/client) and Syncthing (P2P) are already excellent Dropbox alternatives.
It seems to be built for a different use case; Nextcloud (server/client) and Syncthing (P2P) are already excellent Dropbox alternatives.