If you're a contract developer, or a developer working full-time for a consulting firm, you might not have the authority to determine for yourself whether it's contractually allowable to upload code to Kite's servers. But if you're working for a pro shop, you can bet every dollar in your pocket that the contracts your firm has with its clients technically prohibit it.
Kite is really neat, but I'm a little uncomfortable with the idea that I'd have to remember to remind consulting vendors not to let their developers use it when working with my codebase.