Fundamentals Chainlink

Hi, I’m just learning about Chainlink (I know a bit late, nevertheless better late than never). Seem like a great project links the physical world with the Blockchain. Great, probably a dozen of use cases. However, I wonder what do I get fundamentally when I buy the coin? Say that Apple is a great company. Buying a Apple sticker or a symbol for apple wont earn me any money. Whats the reason I will earn money buying Chainlink other than somebody else wanting to buy it for more at a later time? Is it scarce, similarly to Bitcoin? I guess this question apply to all altcoins. Insights anyone?