There was once I transferred money from Bitcoin to a Bitcoin cash address accidentally. The money was lost forever. It was a weird reason due to being syncing , but yeah you could lose money just like that while most people wouldn’t be able to explain it or understand it.
That has been solved with more user friendly wallets. If you're using a Qt wallet you'd think you knew what you were doing. The Qt wallet actually even tells you not to do anything until it's done syncing so you must have closed that overlay and ignored that warning. User error, that's your fault.
This is a great example of why Bitcoin has failed: you do not build faith in a financial system by reportedly telling people that any mistake will have no way to correct it but they will be mocked for not being perfect.
