Again there are many different types of tokens that do many different things. One example, there are tokens that help secure the network (as in proof of stake)

Again there are many different types of tokens that do many different things. One example, there are tokens that help secure the network (as in proof of stake) and in return you get fees (aka yield on your investment). This is just one example. There are many others, like lending out USDC (token pegged to USD) -- you can actually get 10% yield. You can also provide liquidity in liquidity pools and earn fees (again yield on your money at risk).