Consent doesn't work that way. Imagine posting a sign at the entrance to your house saying "all those who enter here consent to being groped".

Notice is not consent. Your statement that users are notified is a red herring. Users must also consent, not just be told of an entity's plan to violate/assume consent.

Surveillance without consent is unethical no matter who the data goes to, or whether or not the data is anonymized or otherwise stripped of PII. It's stealing of information unless the user agrees to it in advance.