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Should the exchange be reported to Google for this so that Google can know? All that I am thinking of is for people to report the exchange.
Yes, you can report it to Google. I hope the form in the screenshot is part of the main domain to provide strong evidence that they are actually running this program.
That could be a good additional measure. I remember when Google de-indexed Cointelegraph last year. I think Google would do the same for any abuse of its ecosystem platform.
I think it is better to let them pay for these reviews, so when they spend a lot of money, only then report it. then g00gle will penalize them plus delete all fake reviews. A real waste of money. Why not make that lesson as painful as possible.
Meanwhile, you can be paid to write a review and you still criticise the project just as we have seen in review campaigns in Bitcointalk.
It's one thing when you want a realistic review to improve the platform, and it's quite another when you want high-rate reviews to mislead others that you're a 5-star service.