This is a no brainer as you know. And almost all of them are one time reviewers adding to more evidence of site manipulation. Sitejabber offers a paid premium service for inept companies to improve their ratings like Nextdoor.com.
Of course this makes this site a joke as well and not a true review site. Nextdoor's rating was a one star before they signed on to premium service. If zero stars were available, then that would be their true rating.