They don't have to say anything. Just make griffin mounts that run or float a little above ground and call it a day. Who cares what the backstory that explains the lack of flight of a mythical creature in a video game is? Geez. Just release a griffin mount for 8 trillion crowns that can only be purchased for an hour in the middle of a Tuesday...or, better yet, lock it behind scam crates and then go take a long swim in your pool full of gold coins like Scrooge McDuck.