I have to say that I disagree with the whole notion that Tapas should stop notifying us about their series, even if I understand the frustration. They need the promo, and let's be honest, they will not stop notifying us no matter how many creators complain.
I however believe that the mere promo notifications aren't the problem, but rather the notification system as a whole. Many times during the night, I get multiple notifications, but when I wake up, I only see the latest one. This is pretty faulty and I think makes the issue with promo notifications even worse.
As a solution, and I hope someone from staff is listening, they could expand the notification bubbles. Like when you get a comment, you get a notification that looks like a speech bubble, or vote is a simple heart notification (think Twitter), subscribe could be a little head of a person and so on... The actual promo could stay as the little tapas mascot. This would help with confusion and I think would at the very least come off as less annoying for many creators who care more about their engagement than promo of featured stories, and readers could continue get what they want: promotion of new series.