Well they published their source code.

It’s not as permissively licensed as usual open source projects, but I would argue that in the true sense of the phrase, this falls under “open source”.

Which afaik runs very well under Linux.

If you worked on smithing knives sorry but you must have known eventually someone would get stabbed

If you worked on building cars sorry but you must have known eventually someone would drive one into a protest

If you worked on producing painkillers sorry but you must have known eventually someone would trigger an opioid epidemic for their personal gain

…

A tool is a tool. Regulation and responsibility determine the associated dangers.