[joe_the_user]

I personally, as GM, don't like to be the one that kills a character. I want to set up a situation where the situation-and/or-the-rules kills the character.

I've played in games with "the GM kills you" mechanics and it felt juvenile/arbitrary/abusive. Remember, this is a game where every players' character needs to "shine" and similarly needs to know they're being judged with fairness and compassion by the GM (compassion especially along the lines of "understand what I say my character does as something reasonable").

[biotinker]

Isn't that what I proposed in my example though? Where a rule is made in advance that if the player abuses their power, they die. due to the canon situation in which that player's character existed?

A player that in good faith wanted to role play such a character, would work with the DM in advance to structure rules well-understood by all parties about exactly what would happen if they abuse their situation.

All the DnD situations can be trivially resolved by good-faith and communication on all sides.

Unlike Chat Control, where good faith cannot be assumed.