I'm confused. You say Google "states in its privacy policy that it won't use it for anything other than to provide the service", but that's not good enough, bec

I'm confused. You say Google "states in its privacy policy that it won't use it for anything other than to provide the service", but that's not good enough, because they can amend it later to remove that protection. How is that different from the other providers, who (as you said, again) "clearly state that they are only taking rights to your work for the purpose of providing the service"? What is different about them which stops them from amending their policies?