Went through this but it doesn't still seem clear to me maybe going over it some couple of times and a lot of research would make me understand better
It totally depends. Most DeFi platforms differ from each other. Mostly the tokens are for governance, sometimes for staking(revenue) rewards, etc.
Okay so if I am correct I think you're saying all or most of token should be linked in one way or the other to a Decentralized Finance (Defi)