You also don't need permission, as a human, to read (and learn from) the internet in general. Machines by standard practice require such permission, hence robots.txt, and OpenAI's GPTBot complies with the robots.txt file and the company gives advice to web operators about how to disallow their bot.
How AI should be treated, more like a search index, or more like a mind that can learn by reading? Not my call. It's a new thing, and laws can be driven by economics or by moral outrage, and in this case those two driving forces are at odds.