Can I use this data in my own product?
Inside your own work
Use what you reveal however you like in your own research, client work and internal tooling. That is what the directory is for, and no plan restricts it.
Republishing is different
Wholesale republication of the directory, or reselling it on as your own feed, is not what a Pro subscription covers. The whole asset here is the aggregation work: the archive checks, the link verification, the spam screening and the scoring. Handing that over as a copy would be handing over the product.
Building on the API
Business includes a REST API and a cursor feed precisely so the data can sit inside something you build. If that something is customer-facing, tell us what you have in mind: get in touch and we will sort out terms rather than leave you guessing.
Attribution
Not required for internal use. Appreciated anywhere public.