"You can't just commit crimes on the open internet "
Who said it is a crime, are you a lawyer?
Tbf "is it a crime" is hard for even a single lawyer to answer because it depends on: who you are, your skin colour, how rich you are, your sex, whether it's a white collar crime or not, did you commit the crime on behalf of a corpo, etc.
But we like to pretend that the justice system delivers justice evenhandedly I suppose.
Allegedly commit potential crimes*
I'm not saying yay/nay if this is a crime or not, but if you think it might be, and you create a new account on GitHub to "be anonymous", you're not taking opsec seriously enough for something you believe might be a crime.
By the way, generally judges or juries would be the ones to decide if something was illegal or not, it's not the lawyers who decide this, in any country I'm familiar with.