There has been a few controversies so here is the TLDR:

• Rustdesk public relays have been caught using Chinese servers

• The Rustdesk app is highly privileged for little reason. They abused this privilege to switch Wayland users to X silently

• very little is known about the Rustdesk “team” if there even is one. There is a single github user called “rustdesk” and the personalities on the Rustdesk website appear to be fake.

• Rustdesk says they are from Singapore but there are multiple leads that point to them being Chinese

• They straight up delete any issue or discussion that questions the supposed Rustdesk “team”

That’s just the summary that I know. You can find more information by looking up Rustdesk controversy or is Rustdesk a scam.