"However, by posting Content using Service you grant us the right and license to use, modify, publicly perform, publicly display, reproduce, and distribute such Content on and through Service. You agree that this license includes the right for us to make your Content available to other users of Service, who may also use your Content subject to these Terms"
Does this mean I should have no expectation of privacy or control over anything I upload?
I mean, fundamentally, really consistent security is hard; and the best you can reasonably expect from someone you're not paying is "best effort". For them to make real promises about security opens them up to being sued if they fail; it's not really reasonable to ask someone to do that unless you're paying them a reasonable chunk of cash to offset that risk.
I don't see what security, paid vs. free or best-effort has got to do with my argument, which is that the loopholes in legalese are so hard to spot for anyone but a lawyer, that effectively my data might still be used in any way and possibly against my wishes or expectations (but which becomes legal when I consent to the PP and ToC).
Would you mind describing the kind of data you work with and which constraints you're subject to?