I literally had this discussion at work today about vendor lock in. with AWS Lambda.

At my old job, we were terrible at wanting to use new shiny things (me included). We had terrible vendor lock-in with AWS, although it did make my resume look nice as I could fill it with fancy AWS products.

My supervisor was discussing AWS Lambda with me at lunchtime, and I said that it's not worth it, because any cost savings from using Lambda over a server are outweighed by the cost if we ever wanted or needed to switch vendors.

AWS lambda would make sense for large companies, where server time is more expensive than developer time. But for most companies, developer time is more expensive than server time, using shiny new AWS specific tools is just going to hurt later on.