There have been several deaths as a result of using three way fridges on gas in both cars and homes.
Some people are literally terminally stupid. But it is a very, very high price to pay for using a fridge wrongly, or a gas camping stove, or a gas bottle without the proper fittings!
I bought two gas fuses for my bottles at Bunnings. $29 each, IIRC. One each for fridge and stove.
Bloody cheap insurance, and they tell you how full the bottle is as an extra bonus.