Totally my thoughts. Plus I thought the email asking him to take down the reviews was fair and respectfully written. And leaving reviews for businesses you’ve not been a customer of is in bad faith.
To be fair, he made clear in the review that it was about something personal, and everything he said might be of interest to potential customers depending on the type of busyness. And while that particular email was somewhat more respectful than the others, they didn't even spell the guys name right, and they should have apologized nonetheless. Childish? Yes. Undeserved? Certainly not.
For me the author can be considered a supplier instead of a customer. Maybe they don't have a legal contract stating the business relationship. But the business owner is using both the software and support of the author. That it is free shouldn't make a difference here.
I think the review demonstrates the management of the company. People don't agree with Zuckerbergs decisions, they can choose not to use his product.
You don't like the decisions/actions of management of a company, you choose not to use the company.
You act like a dick bag, and get a bad review. It shows you don't know how to conduct your self maturely. Not someone I would want to go into business with.