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As others have written, Erdős was a lifelong curator of mathematical problems, from high-school level problems to the types that will land you a Fields medal. Like the Collatz conjecture.

Most new math problems appear in other papers, doctoral dissertations, etc. Usually you'll find them in the "future work" / "future research" section.

So obviously in order to present and formalize these problems, you either need the author(s) to do it, or some reader. At this level of math, there are many extremely niche fields, where the papers might only be read by a small amount of people.

In short, it is a visibility problem.

But, I figure, there's some potential use in AI models to extract and present these problems, which would make them available to a larger audience.

That is exactly what Erdős did. His life revolved around math, and seeking mathematical questions.