if you mean users can get passive income by buying their tokens or holding their coins. surely many NFT token projects or smart contracts offer these features in their coins. like NFT games. staking . you can get extra income from that. and if you want do that type investment you need more extra carefull with your own money . DYOR first.
For now, most people will offer staking, as well as yield farming. well, it is one of the most preferred ways to earn passive income in the midst of their busy life.
however, nowadays, NFT games are very well known for being able to make us get passive income too. games like Axie, My Neighbor Alice, and others, also offer a large enough income to be used as passive income. however, back to the investor, preferring to play games, or just waiting for staking or yield farm.