In the case of "scrapped a bunch of data about you without your knowledge or consent" I agree, I can't imagine a case where it would benefit me. More generally, I'm not really sure. I like the idea of being able to clean up data for others, especially with how abusive some companies can be. But I wonder if the same process couldn't be used in an abusive way to delete some data. I don't have a definitive answer to that.