For me, it's quite the same. It wasn't the game mode that changes the game and makes a gambler bet more and more, but it is the stakes and the multiplier of how huge you can win. Gambling is mostly on satisfaction on both making profit and testing your luck with it, not with whom you are playing to - many people or just PvP gambling. But in most cases right now single-player type of gambling is the most common, especially in sportsbetting and crash games.