Harm depends on your threat model. For a streamer wanting to avoid being swatted then the typical data broker removal service could be quite helpful. I agree a big part of the problem is lack of understanding that the removal services only work at one layer.

There's probably even more than these, but here are some from the video: Healthcare data brokers, fraud data brokers, financial data brokers, marketing data brokers, people search data brokers.

Good video explaining the situation with data brokers and the removal services: https://www.youtube.com/watch?v=iX3JT6q3AxA