The developers will get a percentage of download fee when a person downloads the game from App store or Play store. The more the downloads, the higher will be the revenue earned. When the players buy or sell the NFTs on the Gaming NFT Marketplace, there will be a certain amount of transaction fee that will be charged. The developers can earn revenues from this as well.
NFT itself is a great revenue generator if you are doing the right way. Which means that at first when it is minted there will be some money coming to you, secondly when we are talking about a great NFT that means people will be moving it around. I will buy, you will sell, this will create a market that is constantly changing hands and that means if you put like even a 1% tax, that could bring you a lot of money depending on how much trading happens.
So at the end of the day, you do not even needs tokens or anything else, all you need is all your NFT's to be minted right away, and then constantly traded for a long time which will bring you a steady income.