You risk losing your entire Google account along with all documents, photos, mail, and whatever else you have there. Enough stories of this happening if you look around.
The risk always exist.
Also are you really using same account for gmail, your personal pictures/docs and youtube?
you risk that regardless, which is why I don't rely on them at all
If you're just a normal user the risk is very low. This almost always happens when someone using Google APIs for business purposes trips a fraud or spam detector.