[ahoka]

Their pictures were used in a commercial, for-profit setting without consent.

[mpalmer]

Being "used in a commercial, for-profit setting" is not a thing.

Their images were not being sold, nor were they being used to promote the concert. Plus, nearly everyone who goes to a concert these days agrees that their image will be captured and possibly used in future promotional material.

[alkonaut]

That's what caused the "outrage" (perhaps more "discussion", "introspection", ...). And without that, there is no art.