It's not that risky, specially for early-stage MVP or prototyping. In my opinion, serverless is the future, at-least for 90% of Web apps, APIs and device app backends. It's great for rapid delivery, high scalability and low maintenance from day one.

Cloud Guru, a local Melbourne startup, is built entirely on AWS Lambda. They host Serverless/Lambda community meetups as well, and write about the tech at https://read.acloud.guru/tagged/serverless