I guess the answer is that the developers of web3 games prefer to add their own shitcoin only to then give you staking rewards for your NFT jpg assets while they're working on eventually delivering a game that will use their token.
Needless to say that 95% never get their and the 5% that do dont attract players. In both cases their tokens turn worthless
At least that's what I've seen so far from 2018 up to now.