I noticed them doing that as well, and did what I usually do with companies that get too chatty: First, turn off the notifications, unsubscribe, etc. Then, if they ignore my preferences or keep adding new categories of notification that are enabled by default, I add a client-side rule to throw away everything they send. This way they get to keep thinking that I receive their spam, and I don't have to see it, which is a win-win (though a sad loss for email in general as an obsessively reliable communication system).

This worked out fine for Facebook: I visit their webpage when I want to know what's going on over there, and they never send me email.