Broadly, these are websites which are still web pages, not web applications; they’re pages of essentially static information, personal websites, blogs, and so on, but they are slightly dynamic. They might have a style selector at the top of each page, causing a cookie to be set, and the server to serve a different stylesheet on every subsequent page load.
This rings sadly true to me:
Also, I never thought about “serverless” like this:
Recently we’ve seen the rise in popularity of AWS Lambda, a “functions as a service” provider. From my perspective this is literally a reinvention of CGI, except a) much more complicated for essentially the same functionality, b) with vendor lock-in, c) with a much more complex and bespoke deployment process which requires the use of special tools.