It will make the air behind your fridge warmer in exchange for making the air around your body cooler. There’s usually not great airflow behind the fridge so it won’t affect the rest of your house much.
If you’ve got an open kitchen or something you can still freeze the bottles at night and use them during the day.
A feature that is consistently misused is a useless feature. Either get used to them being used to express disagreement or admit that they’re a failure and stop trying to make them work.
This page has a table of instances with a bunch of info including whether the instance has downvotes.
If it annoys you, you could consider moving to an instance without downvotes so your feed will act like they don’t exist.
Thankfully we can bypass the politicians and implement a better voting system via citizen ballot initiatives in most states. Maine and Alaska have already adopted ranked choice voting via ballot initiatives.