If there's no evidence that it will help you or others, then that's a pretty hard position to argue against. The parent commenter asked about this, and the response basically was that it didn't seem likely to be harmful, and now you're responding to that.

Quite - personal data should remain under your control so it's always going to be a bad deal to "give" your data to someone else. It may well make sense to allow them to "use" your data temporarily and for a specific purpose though.