Then where does your income come from? Do you plan to add ads someday, or other ways, to keep balance?
Promoted posts is a possibility. There are other revenue ideas that have been considered. But the main focus is exploring the possibilities of OP_RETURN. Memo is just the beginning.
Promoted posts (digital billboards) and sponsorships are the best way to monetize this site, I think. Target advertising doesn't work and poisoned each platform it was tried on