Hemlock comes to mind, as with or without your proffered grain of salt, it can be eaten but is definitely not edible. Those defs are posted in a non-pedantic way above, incidentally.
Also, thanks for the chance to use the word 'proffered' in conversation, it's vanishingly rarely used outside the legal field.
Arguably, if that were the motivation, they could just as easily have landed on MissKey. That one is, to MK's credit, human :)
MK also seems to have originated in Japan, so the mascot at https://misskey-hub.net/en/ is not at all unexpected.
Edit: And pretty damn tame as these things go lol