Surplus sounds like anything beyond hosting costs to run the service, but the hosting costs is likely no where near 5 million dollars so a majority of it is surplus.
Does that mean no one gets a salary or is a salary part of the costs to run the business instead of being a "member"? If salaries are included who dictates what the income tax exempt salary is?
I'm not trolling either. What you're describing sounds like a way to run a business where you can avoid paying income tax while still getting a salary because realistically I doubt the creator of Ghost is living in a homeless shelter and working off public library computers.