Oh, you are asking who is supposed to benefit from hiding that the Earth is flat?

I understood your question to mean who benefits from propagating the scam about flat Earth. This one seems to be one of those odd cults with no cult-leader. Those tend to degrade quickly into something with a cult leader or disappear, but the flat Earth keeps defying the rules of social dynamics. (What is incredibly interesting by itself...)

But well, I guess you'll have to ask them who benefits from a spherical Earth. They'll have some name to give you, it will make no sense at all, and if you ask another group you'll get a different nonsensical name. AFAIK flat Earthers come in two main lines, the one that got it from the Bible, and believe it's some version of the Evil trying to deceive people, and one that comes from 18th century propaganda (where flat Earthers were the butt of it), and will have a political enemy propagating globalism.