I'm a 40+ year Apple fanboy, and I detest Facebook.
In this case, Apple are wrong, and Facebook have it right.
As a consumer, I appreciate knowing information about where my money is going when I spend it. So if I was going to spend £100 on a takeaway order from a local restaurant, knowing that £30 of this would go directly to Apple would be useful information - and it would actually make me more likely to phone the restaurant and pay them directly.
For Apple to ban Facebook from providing this information, based on the claim that it is "irrelevant", is laughable.
The truth is simply that Apple are trying to protect their revenue stream, using their might and monopoly to bully and get their way.