NDAs are bullshit
Go'on read one, one day!
They make ridiculous claims and assertions because none of it is enforcable except through Bren contract laws.
If you are the little guy then you don't get to call the shots.
I was once asked to sign an nda retrospectively, saying that I would effectively not work in IT for a year and never work in medical IT again. After telling them to go fuck thenselves, I eventually had to get a lawyer to tell them to get fucked.
Now I just refuse to sign one ... Ever... And now I can't see the magic leap device, boo hoo