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The fact that they chose some specific photograph doesn’t disprove that photographers are largely substitutable.It does, that's a market at work. Why do I choose one thing over another one when there are lots of competitive options and essentially no barrier to entry? Because I value it more, I think it's better for me then whatever else there was. This isn't an area of natural monopoly, in fact it's about as polar opposite as can be.
>Of course some specific photograph had to be chosen
Some photograph is not this photograph. You need to choose "some" car or "some" phone, that doesn't mean they're all perfectly interchangeable. Furthermore no, there was no "need" to choose anything that they didn't own copyright to or wouldn't negotiate for, because they could have made their own or asked any other person who took photos at that concert, many of whom likely would cheerfully give it up for free. This was for an advertisement. You're reversing logic here.
>But that doesn’t mean they couldn’t have chosen a different photograph.
Yes they could have which is precisely why it's so wrong. You could have chosen to use/buy, or not use/buy, many different things over the course of your life too. I somehow doubt you just roll a die for every decision you ever make though.
>The only difference would be that a different photographer would be writing the same article about their interactions with the band and sponsor.
No, the whole point is that different people will put different values and terms on their work. So if you don't agree with one person's, you go to somebody else. Not liking their terms though doesn't mean you necessarily get to just take it. Seriously, how could you possibly even get that into your mind in a case like this?
And again, if photographers are so interchangeable then this is even more trivial, because they could find any random out of work person or student or fan and offer to pay them minimum wage (or less, many fans might do it just to be able to attend a paid concert for free or get some beer money or something) and take pictures as their agent. Then they'd simply own the copyright directly. If photographer doesn't matter then why not do that? "Equivalent photo" and they'd get it for 10-20 euros (or less).