The problem is that especially when it comes to construction companies, negative claims by users must be reviewed by the forum operator. Of course, this is difficult to enforce. During my time as a moderator, users were required to provide sworn affidavits and corresponding evidence for the claims. Only then were posts published. The review was carried out by a moderator who voluntarily invested a lot of commitment and time into the forum. (You can still find posts here under the name Bauexperte formerly E P I). However, since she herself was an entrepreneur in the construction sector, she was personally sued by a construction company for slander or similar, even though she had mitigated/partially or completely deleted posts. For me back then, this was completely incomprehensible because she really was the good soul of the forum and basically always neutral as a moderator. Shortly thereafter, many moderators withdrew for various reasons, and I can imagine that the operator is reluctant to bear the effort to review all the claims. He is an entrepreneur and probably does not want to afford the time investment.