So eventually people picked one. Today, the most common are "serverless architecture", "FaaS", or simply "Lambda" (borrowing from AWS).
You don't have to do anything. But it's simply a fact that many people know what you're talking about if you say the word "serverless". And that's what language is, a (kinda) agreed upon set of words which let you communicate with other people. If everyone but you understands a word, and you are crusading that they change it to something else, what is the point?
If you're interested, the concept of "prescriptivism" may be enlightening.