You can get revenue from many sources, as in many individual customers, but be dependent upon a single source for your product.
The situation of startups who depend upon an external large business like Facebook, Amazon or Twitter is analogous to a car dealership that only sells one kind of car - say, Saturns. If Saturn stops selling to you or goes out of business, you're going to have to make some major changes.
The situation of startups who depend upon an external large business like Facebook, Amazon or Twitter is analogous to a car dealership that only sells one kind of car - say, Saturns. If Saturn stops selling to you or goes out of business, you're going to have to make some major changes.