I've never once starred a GH project, nor ever looked at or considered the star count of a project in order to evaluate it. What do people actually use this metric for? (This is not a rhetorical question. If you use it, I'd like to know why/how.)
e.g. I might search for "TypeScript ORM", open five popular repos, and then compare the two libraries with the most stars to make my decision.
I also use stars to bookmark projects, and I'll usually unstar a project once I've tried it out/no longer need it.
So i star repos that are developed outside github so my contributions show up on my profile.