Google allows people who are not customers to writ...

Google allows people who are not customers to write bad reviews on companies even write reviews that advertise for competing companies and when reported nothing happens about it. Now, people who write reviews are referred to as 'Customers' in Google My Business but according to Marriam-Webster a customer is defined as "one that purchases a commodity or service," yet there is no way to verify these are actual customers who write those reviews. I talk to business in my industry frequently and this is a widespread problem with non-customers and competitors writing bad reviews about our companies.