Series Of An Ad War

At first, I didn't know that such companies are allowed to do this on ads...I even once read about ethics on ads that do not allow a company to "attack" other companies explicitly by words...but this one, is obviously attacking one another, which I find really cool...actually...hehehhe....

BMW started the war....
Then Audi replied...

Subaru uninvitedly showed up to say hi...

and what did Bentley had to say to these three..?
Lol...and seriously, this is Bentley's real CEO....woww....