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Serverless is an adjective so you can slap it everywhere.

Worker-based or FaaS (function as a service) don't roll off the tongue that well.

I'm not advocating for the term, just trying to explain why it is so popular.

Also, serverless solutions like DynamoDB or S3 aren't compute, so worker based and FaaS would simply be wrong.

They probably call them serverless because you are mainly billed by the number of requests instead of the number of hours it runs for (although for Dynamo, there is a cost per table and r/w)

Would we lose any meaning by just calling DynamoDB and S3 managed solutions, like in the old times?

EC2 is a managed solution but you still need to manage servers.

Elasticsearch and RDS are also managed, but not serverless.

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