Has anyone ever seen the keeper jumping for the ball, getting nowhere near it and yet colliding with attacking players?

I've seen loads of examples and very very few fouls given against the keeper. Why not??

To me, Van Dyke was jumping honestly and fairly for the ball and made contact with the keeper in so doing. Or did the keeper make contact with him??
Van Dyke's arms weren't flailing. His elbows were down.
Why does that have to be a foul?
The keeper can do exactly the same - contact an opponent during his attempt at reaching the ball when he's left the ground and "not in control"- and yet fouls by keepers are rarely, if ever given.

A keeper has to assault an attacker before a penalty is given.

Days of smashing the ball into the net still attached to the keepers hands are thankfully a thing of the past with the potential for serious injury.
But come on... two guys should be able to jump against each other without automatic foul if the keeper drops the ball.

After all, we've seen with our own eyes relatively recently that you don't need to be challenged at all to sometimes drop the ball.