Yeah I saw that a few days ago and was pretty shocked by it. When you see the onboard of Magnussen, you can see he looks in his mirrors, knows Gasly is there and then turns.
As the stewards say it was completely unnecessary and I'm surprised it didn't result in a big accident. K-Mag said he apologised to Gasly at least this time rather than a '**** my **** honey!' style response like he gave Hulkenburg last year
Magnussen and Verstappen (to a slightly lesser extent) are too aggressive, and hopefully they will learn, but they have both had multiple seasons in F1 so should know better by now. Hopefully 1 or both will get a race ban at some point and it might teach them a lesson. To finish first, first you must finish, as the great Ron Dennis used to say.