Really? You expect people to share information per Google and believe they won't being able to be identified?
Before i learned that you use Google i was willing to participate in and share your survey, but after i won't, as nearly all of my peers would.
Google was more than once (or more like: more than dozens of times, maybe even hundreds of times i lost count and there are many courts) sentenced by european courts for various data protection reasons.
Why not use a university for hosting a research survey?
In my eyes your study lost creditability by using Google for the survey. Maybe you get the 1k to 5k responses you want, but as up to 20% of all internet users (their highest market share value is about 80%) try to avoid Google, and therefore won't participate, these responses you get won't be representative. Sure perhaps they don't need to be, but none the less the study would be more plausible and therefore better for your cause.