There are thousands, if not millions, of developers, now using serverless to build real-life customer-facing applications. As in the whole new tech, it gets adopted for non mission critical apps first between 2016-2018. Starting with 2019, more and more companies adopted the technology and the Cloud providers, especially AWS, invested heavily to improve the integrations and remove the roadblockers. See how Lego has moved the whole e-commerce app into serverless. https://medium.com/lego-engineering/accelerating-with-server...
I also strongly believe that severless is an overloaded term and everyone understands something different from it. Some people consider this only as a FaaS but I think that it's any cloud service, that can auto-scale to infinity, scales to zero, pay-per-use and managed. I frankly believe Serverless should be regarded as a paradigm rather than a technology advancement. here's a very nice blog about it: https://ben11kehoe.medium.com/serverless-is-a-state-of-mind-...
Serverless as a term mixed up with FaaS. In 2022, Serverless is more general as it can be defined anything that autoscales to infinity and scales to zero when not used and pay per use. Amazon DynamoDB is also serverless in that sense for example.
Not sure if it's what you really want to see but there's a new solution called Serverless Cloud that lets you write only code in JS/TS. This platform handles the infra management itself. It has frontend sync, global CDN, secret management, event-driven design possibilities. https://www.serverless.com/cloud/