I was just in this dilemma to begin to eliminate accounts and random stuff I signed up for in periods of my life that are long gone. Many of them still have my email for some registration I made but have since eliminated all the emails and only get these annual privacy notice updates that seem mandated somehow. Even those I don't welcome because it's just another distraction to have to bother with.
At some point I wonder if these organizations realize that if they continue to dishonor unsubscribe attempts that they simply get marked at spam. In the context of gmail I always thought too many organizations that get marked as spam just hurts them beyond the user they did not honor. Does anyone know if this is so?