Thanks @WilfriedB , and sorry everyone for my late replies in this conversation (and in many others) as I’ve been mostly offline for a few weeks.
Obviously I am not an expert about German Laws, so I spent a few hours studying the matter (Thanks Gemini for the help!).
Briefly, as far as I can see, frequently the businesses are abusing of the possibility given by the law.
The law contains many nuances, including that defamation must be proven, and that a distinction must be made between “false statements that are intended to discredit the business” and the fundamental right of everyone to express their opinion (Article 5 of the German Basic Law).
I am preparing a file to better escalate this anomaly to Google