I understand why Hamilton didn't get a penalty and why Verstappen did and it's fairly straight forward the reasoning for it.

What I don't understand is how Verstappen's move was any different to Nico Rosberg in Canada (last year I think it was) when Hamilton was overtaking him down the back straight only for him to out-brake himself and keep the position. The position was Hamilton's were it not for that and yet the Stewards did nothing. It's another case of inconsistency.