Ello, the notably stripped-down, ad-free social network, announced Thursday that it has taken $5.5 million in venture capital and re-incorporated as a “Public Benefit Corporation.”

The company’s founders and investors also published a one-page document in which they declared:

Ello must never make money from selling ads Ello must never make money from selling user data In the event that Ello is ever sold, the new owners would also have to comply by these terms

So how is Ello going to make money? Even its investors don't know.

“I’m confident the team will develop a profitable business model that supports our investment,” wrote Seth Levine, an investor with the Foundry Group in Colorado, in a Thursday blog post. Another investor, David Cohen, wrote on Ello last month, “We’ve always been willing to invest in people with great ideas who put their users first and are looking to make the world a better place.”

We attempted to contact the investors via Twitter but have not yet received a response.

UPDATE 12:15pm CT: Cohen responded on Twitter, pointing out that Ello said months ago it would begin offering "special features" for sale, but that post remains scarce on details. Paul Budnitz told Business Insider last month that the company's business model could include multi-account logins, or emoji packs for sale.