Well, to answer that, the artist was already a significant player in the field (see below link) and the piece was labelled "Comedian" which gives you the sense that he is in on the joke (as was Warhol, as is Banksy).
Maurizio Cattelan has been internationally recognized for his humorous and ironic works which provoke and challenge the limits of contemporary value systems.
www.mariangoodman.com
Could anybody just stick a banana on the wall and have it be viewed as an act of art and not one of vandalism? Probably not. Could anyone draw a Soup Can and make prints of it and have that be considered art? Also probably not.
Which brings up a new question - does the quality of the piece of art matter more, or the name of the artist? And how much does fame play into the name (either before or after death). Many great artists have to wait until they are long gone to be valued. Others use the cult of personality (in its myriad forms) to build value while they were alive. I'm not sure that anyone got this as much as Dali, who was a brilliant artist, but also was a shamelessly successful self-promoter with some pretty awful tendencies. But, in comparison to most artists, he lived like a king. Was that because of his art or because of his ability to sell it, and himself? I don't know.
But, back to this piece, I think this only diminishes art in the eyes of people who aren't interested in understanding art in the first the place, but instead are interested in pretty pictures. Keep in mind, the same people who are complaining about this particular piece of art are also often the ones sharing AI art images online.
And that opens up another can of worms.