It has been requested since at least 2014 [0] and it just sounds like it isn't going to ever be a feature of Syncthing. The ability to have untrusted nodes is

It has been requested since at least 2014 [0] and it just sounds like it isn't going to ever be a feature of Syncthing. The ability to have untrusted nodes is the one feature that has kept me using Resilio Sync. [0] - https://github.com/syncthing/syncthing/issues/109 https://github.com/syncthing/syncthing/issues/109