In 2010 there was a first serverless provider PiCloud, by 2019 every major company providing cloud do Server-less including Microsoft, Oracle, Google and Amazon. You can much more easily scale your applications, get rid of infrastructure management and develop more beautiful code.
If you believe that AWS Lambda functions are just about short Python code, think again. You can develop complex event-driven architecture with logging, scaling, debugging, CI/CD pipelines and much more.
But there are some limits. For example it takes time to start functions on first calls or there is a time limit to long running functions.