I am unsubscribed from everything. I double-check this if I ever claim a giveaway.
Today I put an item in my cart (Fallout Franchise Bundle) to test if it'd report that I owned Amazon derived items from it and/or lower the price more than the store page did. Neither happened. (Separate issue.) I'm 99% positive that I then removed the item from my cart, and indeed my cart currently shows empty - but that too is irrelevant.
~2 hours later, I then got an email: "gogtrial34987, your next game is still in your cart." referring that Fallout Franchise Bundle.
I do NOT want to ever get such emails. This is why my subscriptions page has everything unchecked.
When I click on the unsubscribe link in that email, the resulting page says "You are now unsubscribed from Promotions and hot deals" - which suggests that this is the subscription setting which governs getting that email. But again, that setting was already toggled off.