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I just have one word for you: TightVNC. That's what made me uninstall RustDesk.
Why not TigerVNC? https://tigervnc.org/ > TigerVNC was originally based on the (never-released) VNC 4 branch of TightVNC. It seems to be popular, that’s why I’m asking.
Funny thing is that the document where they'd explain their reasoning to fork TightVNC returns 404.