If B if your answer then I doubt you have long to wait. There's already games like axie/roy that do that sort of thing but not with good graphics/strategy yet imo as well as live table games (which I assume function like actual casinos and I was under the impression they have these for blackjack and poker).
I'd prefer a PvP that was designed and played like an MMORPG but I guess we're a while away from that being a thing (wagers could be placed on leagues of those imo too to make it more appealing to gambling).
I feel like it's going to be the future one day.
Imagine a game like diablo that uses a cryptocurrency instead of gold. You drop crypto in game, use it as a currency in their store, can spend it on exchanges outside of the game, hold it in a wallet and wager it in casinos. Then you can also bet it against other players in a pvp within the game and win more.
As far as I know PvP gambling is not a thing yet, not even in the simplest way like 2 players playing chess or something. The only way to do PvP in a casino is to play poker.
I think because it has a very small niche, as most of gamers are medium skill players.