I understand the only technical information that a developer needs to provide while registering a SaaS product is its entry point (URL). But is it a prerequisite to run the service on the platform in which it is being sold?

To be more specific, if I own a service that generates a story based on the current affairs in the world, do I need to be running it on AWS to be able to sell on AWS Marketplace?

I did not see this in AWS docs anywhere, but I was wondering if I maybe missing something!

How would AWS marketplace benefit from listing a SaaS product that actually runs on their competitors cloud?