Because Glassdoor have very lax community standards and say they're "not fact checkers", literally anyone can write a review about any company. This means that companies could write nice reviews about themselves, people can write horribly untrue things out of spite, and companies can write terrible reviews on their competitors page to make themselves look better. What's worse, is if a business attempts to disprove false accusations, Glassdoor can't do anything about it even if they cared to. Their policy is that employers will never be able to remove/alter reviews to suit their agenda. This I can appreciate on some level and I think the site itself is probably useful to job seekers, but there are zero safeguards in place for employers and I find that to be ridiculous.
