It does if a site did something stupid and included something useful in the url that lp has stored.

Edit: it also makes phishing much easier. That Metadata can be used like this:

You have an ms account and an Adobe account. I know because I have your Metadata. I send you a sophisticated phish saying that Adobe is no offering to link to your ms account for single sign in. Just enter your Adobe and ms ids on this form...

It might not hit you but it would get a lot of users.