Why do people always ask “why?” on these things? Not everything has to be “useful” or have commercial value. The original games aren’t going anywhere. People just enjoy doing this kind of stuff, pushing the technology to make interesting things.
"""At the 1983 Academy Awards, Oscar voters declined to nominate [Tron’s] pioneering special effects. Lisberger said it was because they felt using computers as an animation tool was cheating.""" - https://www.moviefone.com/2017/07/08/19-things-you-never-kne...
Who said it's art? It's new and cool and fascinating. That's all.
Contrary to what you wrote, these AI-generated ones aren't replacing the originals. The originals are still there.
Sorry, but I think you're reading way too much into this... it's a fun toy, it's not replacing game art and it's not an "abomination". It's cool and new. That's all.