I understand that. Still, it isn't anonymous then. I don't surf the web logged in to my Google account. I only log in when necessary (and immediately out again.)
And why would anybody try to manipulate your survey by doing it several times?
But if Google is the way it works best for you, I don't mind. It's just that I am usually willing to answer surveys like yours. Some that I did used Surveymonkey. That worked fine for me.
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