The business model, if you wanna call it that, is a private messenger for evreyone, financed by donations (which has been clearly communicated, particularly lately). In contrast to for example Matrix, there is no venture capital involved, it is a donation-funded non-profit (which has also been clearly communicated).
I would be curious which business model you would recommend instead for a sustainable messaging solution and how you would start such development, if the OTF is evil?