I'm not sure there is a formal threat model yet (I'm not a maintainer), but there has been discussion regarding this topic. You can checkout the Github forum page (https://github.com/markqvist/Reticulum/discussions) and there is also an Element channel at #reticulum:matrix.org

The threat model would be highly dependent on the carrier used. For example, if you're using LoRa an adversary would be using far different methods of disruption when compared to a traditional overlay network.