The IP and that the industry is very big-release centric. Even the engine you are working with is often news, people monitor and report on job listings for this kind of thing. It's obvious and uninteresting that a slightly updated new version of google sheets will release probably like every day, and they will be virtually indistinguishable from the previous ones. If literally anything you say about your work on GTA6 is news for the next N years, you don't post anything. The few non-indie devs I see publically online are usually for live-service companies like riot.