Decentralized poker is a working proof-of-concept that it's possible to increasingly develop complex, multiplayer applications that don't rely on any servers at all:

• The game creation / player matching code is in a smart contract
• The front-end UI is stored on-chain and can be viewed via a web3url-compatible browser, add-on, or routing website
• The game logic is managed by the "dealer" player
• The p2p communications is managed through XMTP, a project that aims to decentralized p2p comms

This shows that it is possible to create complex decentralized applications. There are improvements that can take this further:

• In the case of poker, a full application of the "mental poker" algorithm would mean that the dealer would not have any secret information, so players could bet money via the smart contract in the game of poker - creating the first 100% decentralized casino game
• The p2p communications could also be distributed further, potentially 100% so, if connection details were shared between players so that players could connect directly 1-1 with each other via WebRTC

Taking all of the above to the furthest extent, it's possible that with a combination of smart contracts (which can perform decision-making logic for games that does not require secrets, including multiplayer game creation), and clever game logic management using cryptographic techniques, that increasingly complex games could be entirely decentralized, allowing for new types of games to emerge.

From varying combinations of the above pieces, and proper cryptography, it's possible to create verifiable tabletop games like Battleship, Checkers, Chess, Poker, Blackjack, and more, all of which could be played with verifiable results, and result in player betting / payouts on-chain.