https://www.alamy.com/blog/ai-and-your-images-protecting-rights-and-creating-opportunities

Announcement from Alamy on April 25. Item #4 says:

While the sources for AI image generation by many platforms are at worst scraped without permission and at best unclear, we cannot accept AI generated material on Alamy. It already breaches our standard terms and conditions because it is not necessarily free from rights. We are in the process of removing all of this content that we can identify.

Not sure how practical that is long term as AI improves but well done for trying.

As opposed to other agencies who aren't bothering and seem to just accept the fact it'll flood their collection.