Some games have warnings, some do not
(Warrent) There have been many deaths and sucides that have been caused by playing long hours on video games. In the article there is a section that a game warned against long hours but implies that there isn't any on all games
Of course the family tried to sue Konami for millions of dollars, but there wasn’t any actual case because the warning clearly states the warning of seizures and other health issues while playing the game. Now we know why those warnings are on those games and should actually read them before playing.