Knowing AWS SES rules and seeing the lack of context from your post, I'm going to guess that either you're embellishing the story, or your content quality is low enough that users see it as spam. 50 a year that is one a week; I need to be super motivated to stay subscribed to a 1-a-week email from a single content provider.
Bounces also have their own system and should be handled by your email system as well.
Bounces also have their own system and should be handled by your email system as well.