First thing to do is define what art is.
One can look at 2 things. The result (what do we see) and the process (how was it made).
Some people in this thread state that art is only art if created by human beings.
At first I was a bit skeptical about this statement, but there is a truth in that.
Why? I will try and explain with a silly example.
Let's imagine a white beach. Someone has put 500 paint cans in a storage unit located on that beach. Then all of a sudden a very very heavy storm comes up. It blows away the storage unit and cracks open the paints cans. The paints start flooding all over the beach. The colors mix up and the heavy wind creates amazing never before seen shapes in the sand. Once the storm has passed, a palette of the most beautiful colors and shapes is visible in the sand.
Now, would we call that art? Probably not, because it was not created by a person. It was a lucky, random coincidence that created the result.
So, although the result resembled a piece of art, it was not. Why? Because the process was not 100% intentional. The result was created by randomness and luck.
One could say that AI also uses randomness and luck. It combines a sh1tload of different elements (stolen from real artists) and combines them. If you are lucky, you get a nice result. But the result you get is not 100% intentional. It is an interpretation based on text input.
The artist is like: I paint this 5 by 5 cm square blue. I will add a 9 by 9 cm yellow circle.
AI is: do something with blue and yellow, and let's see what comes out.
Artist: the result is exactly as meant to be by the person who created it.
AI: the result is based on solely some thoughts of the person who instructed the generator and is based on randomness and coincidence.