It depends on what you're storing. If I'm storing a bunch of pictures (I do a lot of landscape photography), I wouldn't care. I wouldn't put my private info like my resume or bank statements on the cloud.
Those might not be real accounts. You can sign up using an e-mail address and start using it before validating it. So I could use literally any e-mail I want to sign up if I'm not being serious about finding anyone on it.