In this example, you're absolutely right, and if all they had was my name and my listening history, that wouldn't be so bad. But some of the ads do reference specific individuals. Spotify in particular have made it clear that 1.) listening behavior profiles may be "anonymized" in the sense that they have had the names sanitized from them, but there is a myriad of other potentially identifiable data, such as location, that has not been sanitized, and 2.) they are willing and able to comb through this data to find anomalies.