What are you doing against plagiarism in your work?
Can we really do anything ? May be one can find a lawsuit but its not easy to get to the conclusion. Some NFT sites have a feature to report theft or plagiarism - only after that, they investigate. Recently I saw a tweet from one of our great artist - someone was selling his art as NFT in millions in opensea. He came to know, only after some of his fans told him in instagram. He would not have even realized that, unless the fans reported. Then he reported and opensea worked, but this is just one example.
I think if the community starts watching out for each other we will get closer and closer. So we should do the little things we observe and point them out in a nice way. If people repeat the pattern I always stand for a full-on block. Working with a true identity helps. The blockchain offers solution for that.