I agree with your comment on the roadmap just being about software analysis and development activity to date. I need to add more to the roadmap now that I have a demo app version such as finding parking providers and parking space users. I also like the idea of a page dedicated to interested operators/parking lot owners who want to take part in the project.
Keep in mind that you just don't take up registrations for anyone interested in being an operator as you still need to filter them out, people might abused it for example they are registering parking spots that they do not own and just wants to monetize/scam using your app. You still need to treat them like a real estate lessor where they need to provide proof of ownership and their capability of reserving the spot for your users. Bottom line is you still need to know them as their parking spaces will reflect directly to the service you are providing.