This is pretty much my take on it too. Lewis, and other drivers have been forced off the track enough times that it's almost a phycological advantage that Max has, 'I can't try it at this corner as Max will just run me off the track or squeeze me out. I can't fully commit to an overtake as I need to be ready to get out of the way if he does something stupid'.
For many seasons now, Lewis has played the long game and backed out of 50/50 situations which could lose him a front wing or worse, and has won from his consistency and keeping the car in one piece. In his battles where there was respect between the drivers, Vettel, Leclerc and Rosberg (to a point), this worked. Hamilton knows that Max is an aggressive, almost dirty, driver who does not have that level of respect in wheel to wheel situations with other drivers.
Since the start of this season Lewis has done the same as he always has and let Max have the space, and was over 30 points behind in the WDC because of it. Today was Lewis sending Max a message that he's not going to back out of those 50/50s any more and it's Max who needs to think twice before pulling any moves like that in future.