I'm pretty sure it's not "if 5000 stars then free Claude". It's just an initial limit before they bother a human to check if your open source project is valid.
Just like Jetbrains gives away IDEA licenses for open source projects, you need to have some metrics go up before they even consider you.
”ruvnet / wifi-densepose” is currently at the top in the moment. Apparently, its a non functional AI slop. Someone tried installing it ago only to find out the full thing was vibe coded and the entire repo is probably just a front to look good on the their resume.