In addition to Jerf's comment, I will also point out that you can't hide the login info from the content providers. All they have to do is steganographically encode the user name into the web page content. Then they can use your bugmenot-like service to retrieve the page, extract the user name, and cancel the account.
I still see no benefit to the users changing the account info. This is to access sites with free accounts, yes? In that case, isn't it actually just as much work to assert control over multiple bugmenot accounts as it is to sign up for the free accounts in the first place?
I still see no benefit to the users changing the account info. This is to access sites with free accounts, yes? In that case, isn't it actually just as much work to assert control over multiple bugmenot accounts as it is to sign up for the free accounts in the first place?