This is kind of where I end up for most use cases. These are kind of some I’ve assembled so far:

• Internal Private Relay; for internal team communication and collaboration. Something like Notion, Monday, or JIRA.
• Public Relay; for Release Notes. Crowdfunding ideas or small contracts. Like software forums with feature voting or bug bounties.
• Paid-Only Relays; for magazines and blogs, tiered memberships, events. An example here might be an AirBnB hosting a private relay on its WiFi with house instructions, local info, transportation tips and fare.
• A wilder idea here; but say a customer uses a product based relay (let’s use cars as an example). Someone could almost provide their personal data from a vehicles computer; how far they drive, how often they maintenance, maintenance instructions, etc. Either privately with the company, or publicly as a product review. Another analogy might be sharing your data with a software company for performance monitoring and bug enhancements etc - private relays could both report data and collect a kick-back for the data one provides.