People have multiple motivations at the same time. Many OSS contributors have moved on after LLM’s and that’s completely consistent with their motivations.

Some of the major OSS licenses require attribution when someone copies the work in question, AI companies fail to do so. People getting annoyed when others break the social contract has nothing to do with any other motives they can always benefit the world by doing something else.

You may prefer someone continue maintaining infrastructure you use but they could be just as happy delivering food to the elderly. The desire for people to continue helping you is little more than entitlement here.