I don't really understand why Sky would have a problem with it?
They have the rights to the match footage, so Amazon would have to pay them to use it?
City already produce their own in-house content. I think the NY Yankee owned YES network help with that.
United have their own TV channel with their own content. As do Liverpool and Chelsea. All, I assume, show behind the scenes footage.
Channel 5 did the documentary on Liverpool. NBC did a one hour program on City a couple of years back.
So why would Sky be arsed if Amazon did a documentary on City? What's the difference?
The only thing I can think is that this is a brief from the PL. They've done their usual bargaining tactic when the new rights come up for negotiation - linked a new company with being interested in bidding for the rights.
In the past they've linked Apple, Disney, Facebook and others with bidding for PL rights, in order to make sure Sky don't get complacent with their bid. This year they've linked Amazon with bidding for the rights.
Because it will give them a taste of football on there platform and sky could be up against Amazon when the rights come up again, Richard Scudamore will be happy about it.