It's fake because it provides information that can be used for evil purposes: attribution to an individual has nothing to do with it. It's fake if it really is 100% anonymous.
Example: Count Jackboot (your favorite evil politician, Trump or Biden or whoever) is running for office. He wants to know voter opinion on topic X so he can lie about it. He commissions a reputable polling firm to ask people about X, and give him only the aggregated results. The polling firm contacts you, asks your opinion about X, and promises you that your opinion can't be linked back to you. You'll be helping the Jackboot campaign completely anonymously.
You believe the anonymity promise, but that's irrelevant, you hopefully don't want to help the Jackboot campaign at all! Saying everything is private because Jackboot only gets anonymous information is a self-serving rationalization by the advertisers and data collectors. The only way to be private is give no information whatsoever.
Example: Count Jackboot (your favorite evil politician, Trump or Biden or whoever) is running for office. He wants to know voter opinion on topic X so he can lie about it. He commissions a reputable polling firm to ask people about X, and give him only the aggregated results. The polling firm contacts you, asks your opinion about X, and promises you that your opinion can't be linked back to you. You'll be helping the Jackboot campaign completely anonymously.
You believe the anonymity promise, but that's irrelevant, you hopefully don't want to help the Jackboot campaign at all! Saying everything is private because Jackboot only gets anonymous information is a self-serving rationalization by the advertisers and data collectors. The only way to be private is give no information whatsoever.