I've been careful to avoid that button like the plague since hitting it by mistake, so if the warning is fairly new it could have just been before that was added. (Even knowing that there is a confirmation now, I'll still avoid the button like the plague anyway. But it's good to hear that they did address the issue.)

It was at some point while I was new to the game that I hit it, so that was around whenever it was when Crush Crush was added to Nutaku. (Crush Crush is what introduced me to Nutaku and I've checked out many of the games there but Harem Heroes is the one that I've kept coming back to consistently.)