It's possible that the automatic emails stop after 3 attempts, I didn't actually check if it's always the same feedbacks or different ones for which I get emails.
I know that it would be best for you if we responded immediately to every feedback updated from your side, but I can tell you the same: it would be best if Apple responded immediately to every feedback I/we create and didn't let me/us wait for a response for years. If Apple can simply send automatic reminders about unanswered feedbacks while I/we cannot, it honestly feels like being bullied. If Apple wants to take their time to answer feedbacks (which currently means that some are never answered and is quite frustrating), then please give us our own time to respond as well, without being bothered by reminders that wander directly to the trash. I would be happy to keep receiving these emails if Apple showed some more effort in responding in the first place.