>>95889283 (OP)Yami Bakura is a playkiller GM. His story is deliberately extremely unfair, but not "technically" impossible. But he's not trying to cultivate a good game, he's trying to capture peoples' souls and seal them inside miniatures. In that specific case, he was also trying to seize the Millennium Puzzle, but he didn't count on there being a second soul for one body.
Anyway, there is a difference between playing any game with rules and "pure roleplaying." In the latter case, anything that is determined by the mechanics affects the outcome. It doesn't matter how good or bad your character is at something, because you can get the reverse outcome based entirely on luck, rather than playing into expectations on how you interpret your own character.
Sandbox vs structure is a whole discussion unto itself, and it's too reductive to point out examples like railroading or quantum ogre without considering a whole spectrum between "the adventure is fixed" and "you can do whatever you want." These things make for a good topic, but it seems to me like this is just a bait post.