Same old story of centralised algorithms being abused.

Github stars is akin to 'link popularity' or 'pagerank' which is ripe for abuse.

One way around it is to trust well known authors/users more. But it's hard to verify who is who. And accounts get bought/closed/hacked.

Another way is to hand over the algo in a way where individuals and groups can shape it, so there's no universal answer to everyone.