robzilla - 9:37 am on Apr 25, 2012 (gmt 0)
You're comparing Google's content distribution terms to DropBox's and SkyDrive's content ownership terms. Apples and oranges.
You retain ownership of any intellectual property rights that you hold in that content. In short, what belongs to you stays yours.
...is what Google writes in the paragraph you've left out, which leads up to what you've quoted above.
Google's terms are inherently more complex because (a) they're the same for all Google services, and (b) the combination of Drive with other Google services allows you to do much more with the content you upload. If you don't provide Google with a license to host, distribute, modify and display your files, how are you going to use their services? I'd say that in trying to write in a more friendly tone, the DropBox terms are actually less clear and more ambiguous than Google's.
This license continues even if you stop using our Services?!? That's nuts.
It is, and it isn't, depending on their definition of stopping. If you stop logging on, then obviously the license continues; if you definitely close your account, then your data ought to be purged obviously, if not straight away (because that's probably tough to accomplish technically) then at least within a reasonable time.