The companies that sell your data non-anonymously to brokers have always (unless they're shady af) said somewhere in their T&C that they will or may do so, and

The companies that sell your data non-anonymously to brokers have always (unless they're shady af) said somewhere in their T&C that they will or may do so, and the brokers themselves have never said the data are anonymous (unless you're talking about the ad targeting space).