"What went wrong and how?" seriously dude a bunch of chapters ago they said past the 51st floor the difficulty ramps up by a shitload and culminates to "wth is this wall" on the 99th that most people sent there seem to unable to deal with quickly that the reason any hunters are reasonably coming out alive is because the MC likes giving out a helping hand and curbstomps the boss
even if the frog in the well works on the MC the world is still probably gonna be pretty small place and a bare handful of people who could come close to him