If you search for “poker” on PEGI’s site, it seems that many games which are actually about simulated gambling are rated 12 or 16. They seem to think Balatro is more likely to expose children to realistic gambling than, say, Prominence Poker or Pure Hold’em World Poker Championship, which seems completely bizarre, given that those games are about playing poker and Balatro is a fancy kind of solitaire with no betting.
World of Warcraft is probably still in the lead even though I stopped playing years ago. It would be in the thousands of hours, which dwarfs anything else I’ve played.