This practice is common in digital marketplaces. For instance, Amazon doesn't allow Marketplace Sellers (people who aren't Amazon but sell goods on Amazon.com)

This practice is common in digital marketplaces. For instance, Amazon doesn't allow Marketplace Sellers (people who aren't Amazon but sell goods on Amazon.com) to: - link to a non-Amazon webpage - provide buyers with a phone number or email address to reach them at - or any other thing that could funnel sales outside of Amazon