Fake reviews are not that hard to spot. Why don't we focus on educating people on how to evaluate what they read, and making informed decisions, rather than taking information (even if misinformation) away from them? It would help with fake news as well.
This statement seems very suspect to confirmation bias. How would you get to know if what you think is genuine was actually fake? This part of feedback loop is completely missing, and hence I find your above statement hard to believe.
Most people don’t read many reviews though. Just the ‘most helpful’ and the review tally. Worse, the store search results pages use the review scores to rank apps too.