You won't really go to jail for removing mattress tags.
The removal of mattress tags is not illegal for the consumer or purchaser of the mattress.
The removal of mattress tags is only illegal if the seller of the mattress removes the mattress tags.
The seller of the mattress would only likely get a fine and a court appearance is they are found to be removing mattress tags.
But as far as the consumer removing mattress tags there's nothing illegal about that.
You can freely remove your mattress tags without getting into trouble as long as you're not selling mattresses.
Nobody would know you removed the mattress tag anyway and if someone did call the cops about you removing your own mattress tag even if it were illegal the police would likely just laugh and not even show up to the call.
The police have bigger fish to fry anyway.
So remove your mattress tag if you want too as nothing will happen.
Mattress tags used to simply say they are not to be removed under penalty of law.
However now the mattress tags say not to be removed under penalty of law except by the consumer.
So as a consumer you can remove the mattress tag but as a seller you cannot remove the mattress tag.