This is something Google could bring in instead of letting users report everything as SPAM. Sometimes it's easier to click SPAM than clicking on unsubscribe and then close an extra browser tab.
They have bundles now, but this is also a bundle bundler!
Gmail does have a feature like this; many times when marking things as spam I've been prompted to unsubscribe instead.
Giving a third party access to my email makes me uneasy.
Plus marking spam in gmail now also gives you an option (though not always) to unsubscribe from the link too.
This service has been around for a few years; why post a link to their home page now?
I just found out about it and thought there might be others who could use it but did not already know of it.