and been used to hack someones machine

That person was using a horrifically out of date version of the plex server with known, documented, and already patched vulnerabilities.

Do you have a source for this? All I could find is information about the MMU3.

If you’re talking about the MMU3 it’s the same solution they’ve had for their other printers. The only “new” part is the mounting hardware for the Core One. I have one and it’s awesome, but it’s not new.