The author of CardGames.io experimented with switching their API from Elastic Beanstalk to a serverless setup using the Serverless framework on AWS, but found it to be 15% slower and 8 times more expensive. The main cost driver was API Gateway, which charged $3.50 per million requests. The author concluded that serverless was not a good fit for their use case, which involves a high volume of requests. They decided to stick with Elastic Beanstalk.