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I have talked about Google user research program, under this program Google is allowing people to join under this research program to share your experience and opinions about all the Google products and you can get rewarded gift cards which can values up to $75 by Google for sharing your thoughts, experiences and taking online surveys related to all Google products and services.
https://userresearch.google.com/
(KINDLY NOTE THAT THE ACTUAL EARNINGS AND PAYOUT METHODS ARE NOT MENTIONED ON GOOGLE USER RESEARCH SITE,