That a really big stretch. What artist does is not different from AI work, First artist learns from other artist, and also by watching their works, searching for inspiration and in part imitation. If someone writes in style or paints in style, just by learning from watching and analysing the best works or nature, it isnt theft. If it would be, then every artist would have to stop showing their works and keep everything in the cupboard. Ideas cant be patented or copyrighted, and AI works on ideas itself, crumbling a lot of works and deriving the idea from it. Idea that is trained into neural network.
Cant really steal something public for research, either by artist or researcher when Its visual representation is videly available in network. Watching and analysing isnt stealing.
pretending to be original artwork
First it would have to get physical representation, not digital. To be considered an original work of famous artist with great reputation.
Now everyone can generate digital art, but try painting something yourself, its like getting vase painted by an artist, in only one piece in entire world. Its unique, and its an asset. AI doesnt have reputation yet because it cant really paint, only generates digitally.
If they hook up robot arm to an AI and tell it to learn paint like great masters, it could be like getting that artist paint it for you. Then it would be possible to be falsyfying a painting, but there are labs that of course research paintings, the paint itself, the foundation etc… as people of course were falsyfying paintings already.
Personally I think that artist that cant create their works by actually holding the brush in hand, or a pen, or a pencil, isnt really an artist, its only a slightly creative job done by a considerably skilled worker.
I dont consider myself an artist for that reason. I dont even have a pencil.