Think of their node like a relay. If someone is online, then the data might be p2p but Keet acts as a blind storage peer too.

I don't think they worked it out but I think they wanted to figure out an incentive model so others will do this too for payment. Like a cloud storage sort of thing but fully encrypted and no accounts.

If they figure that out then you get a pretty reliable solution without keet being the altruistic backbone. Not there yet afaik.