What's stopping you from `su claude`?

I think there's some misunderstanding...

What's literally stopping me is

  su: user claude does not exist or the user entry does not contain all the required fields

But if your question is more "what's stopping you from creating a user named claude, installing claude to that user account, and writing a program so that user godelski can message user claude and watch all of user claude's actions, and all that jazz" then... well... technically nothing.

But if that's your question, then I don't understand what you thought my comment said.