Old 5 star and 1 star reviews should expire and not be attributed to the overall rating of the business.
I was just looking up a business and reading reviews, and I couldn’t help but notice that all the 5 star and 1 star reviews were made over a year ago, some 5-6 years ago! I don’t think this is relevant to the business and how it operates today.
I don’t think 1 star or 5 star ratings are all that genuine anyways, even less so if they’re years old. There’s just no reason for me to see them and even less of a reason for it to count for or against them.