A closer analogy is going to a gas station where a microwave is offered to heat up any food you purchased. If you don't want to heat up the food, cool. If you expect the food to come hot you're in the wrong place.

Except in this case it's a gas station that only exists for the benefit of its owners and there isn't any food for sale. The owners have graciously said you could still use the microwave if you'd like, though.