> has a terms of service page on its site that forbids bots from taking its images without permission. But that alone did nothing.

It's time to level up in this arms race. Let's stop delivering html documents, use animated rendering of information that is positioned in a scene so that the user has to move elements around for it to be recognizable, like a full site captcha. It doesn't need to be overly complex for the user that can intuitively navigate even a 3D world, but will take x1000 more processing for OpenAI. Feel free to come up with your creative designs to make automation more difficult.