From what I’ve read on Namepros and elsewhere, I believe Igor Gabrielan must hold one of the largest portfolios of good .AI domain names. I think his portfolio of domain names can be found at ai-names.com, which links to an aged thread on the PR.ai forum. I don’t know if that list is current, but it is quite lengthy and contains some strong domain names like Apps.ai, Assistants.ai, Competition.ai, Library.ai….etc.
I don’t think I’ve ever communicated with Igor, and I don’t know much about him. He shared a story about what it was like to register .AI domain names back in 2011, and I thought it was pretty interesting.