Huh? Football fans regularly produce significant costs for the tax payer by way of the huge police and cleanup activities needed for big games, for example.

Even if you take the stance that PP is art - artists have asked for money for as long as there has been art. Doesn't seem unusual to me.

Are you referring to the land in Portugal that they also made available to the public and that they made a lot of YouTube videos and other documentation about? I would hardly call that "unmentioned".