I’ve always seen several videos about this and I’m amazed. How come it doesn’t electrocute everything and catch fire, right? It seems like this oil doesn’t conduct.

I’d like to know what the pros and cons are of submerging the PC in this oil.
One of the pros, I imagine, is that the components in the case don’t heat up anymore? And also that you no longer need to clean it to remove dust?
But what about the cons? What would they be? Is it expensive and does it maybe require maintenance?