It may only apply to Direct IP Access, but isn't that what many would expect (not trusting middleman to be secure?)
>RustDesk is a single open-source application (AGPL) with its own architecture. Clients connect outward to an ID/rendezvous server, which brokers a peer-to-peer or relayed session. Per the RustDesk documentation, traffic is end-to-end encrypted (built on NaCl)
You either pick a middleman you want to trust or you run one of your own, if you don't want that or need the features if offers RustDesk is not for you.