The Perfect product, if ever there can be one, would be something like this...
1) It is Digital
2) It is created once and the same product or service is sold to different customers
3) Customers pay for it not just once, but every month, or year - as a subscription

Listen to the show for the rest. Search for "CutToTheChase" as one word in your favorite podcast app, or online at https://CutToTheChase.fm.