It'd make sense that for any service someone signed up for they'd have to prove their identify (usually by signing in to the service) in order to remove that data, but for a service you don't have an account for would it matter? If someone just scrapped a bunch of data about you without your knowledge or consent why would it bother you if it were one day gone because someone else requested it to be deleted?
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.
