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It is not strictly limited to the CGI protocol, of course, but it is the marketing term for the concept of the application not acting as the server, of which CGI applications would be included. CGI, like all serverless applications, outsource the another process, such as Apache or nginx, to provide the server. Hence the literal name.
> "Serverless" is a marketing term for a fully managed offering where you give a PaaS
Fully managed offerings are most likely to be doing the marketing, so it is understandable how you might reach that conclusion, but the term is being used to sell to developers. It communicates to them, quite literally, that they don't have to make their application a server, which has been the style for networked applications for a long time now. But if you were writing a CGI application to run on your own systems, it would also be serverless.
