Wilder turns his head to his right side, so it's not unlikely that Fury's right hand (half punch/half swing) lands at the back of the head. I don't see an intention from Fury in this particular moment.
It's a legal shot. The punch landed on the ear, but the angle made it seem like it was closer to the back of his head. See the replay in 2:00 and 2:08 of this video. 2 different angles. The 2nd angle show the punch bouncing off the side of the head of wilder. This content is protected Here is the image of the moment of impact. Notice Wilder's head is blocking the glove. https://i.imgur.com/R4uZXRw.png
It didn't really look that bad to me. I agree that hitting someone in the back of the head is very bad, but when two fighters are wildly swinging at each other, of course it's going to happen by accident sometimes -- I think fighters often get criticized a little too much for it. It's happened a lot with Wilder's punches in the past, and I've never thought he was doing it intentionally. I do recall cases where it did look intentional to me, and I think those fighters did deserve criticism for it. The most recent example that comes to mind is Gorman's dirty tactics against Dubois.
Fury would have had to hit Wilder pretty hard to the back of his head to make him bleed from the ears. Fatally hard.
In the ring it's protect yourself at all times. Turning side on and taking a straight right down the pipe to the side of the head is a failure of the above, no fault of the fighter throwing the punch. Hilarious that some people are calling it a rabbit punch. Rabbit punching is a deliberate attack by wrapping punches around the head, not throwing a straight right.
It looked good to me. Wilder turned his head, the punch was already traveling.. landed just behind the ear, errr Wilder shouldn't have turned that way. We've seen thousands of punches like that, it wasn't a deliberate behind the head shot, so just stop it. Accept it, chew it, swallow it, digest it.
Perfectly legal shot to me. Wilder moved his body and head simultaneously once Fury launched his right straight.