Tokens should be viewed like stock. The team behind the token has a pool to fund their network / app. Different products in the decentralised finance space (DeFi) incentive usage by handing out their tokens (stock) to people who provide value to their product. In DeFi this is usually by becoming a liquidity provider (LP), providing your own assets to their protocol in return for a fee and incentives.
This makes logical sense for the team, because the most common metric for valuing an app is "total value locked" (TVL). The more TVL an app or network has, the more usage and value it has, which typically translates into increased value for their token.
There are way too many protocols to list. Checkout Velodrome as an example of a very high APY protocol https://app.velodrome.finance/liquidity?sort=apr&asc=false
