If artworks you create are automatically copyrighted but when you post it online, how does that come into play when people use our artwork for AI?
Answer:
The jury is literally still out on whether or not training AI with copyrighted materials is legal or not, and what the copyright status of the output content is. Here are some current cases in the court system in the US:
https://stablediffusionlitigation.com/
The current legal cases against generative AI are just the beginning
The AI boom is here, and so are the lawsuits
One way image aggregators are trying to stop AI scraping is by specifically prohibiting the practice in their usage terms. Remember, license beats copyright - if the site (like Getty Images) says it can't be used for AI training, it legally can't be used for that purpose.