I'm not worried about myself with the stars and forks, I'm worried about the people who starred and forked my repo and the costs that moving my repo has on them

I'm not worried about myself with the stars and forks, I'm worried about the people who starred and forked my repo and the costs that moving my repo has on them. For the stars, they presumably did it to get update notifications. I guess they'll get a notification if I update the README, and they can decide what to do about that. I'm making things just a little bit harder for each of these people though. Forks are even easier to maintain than you're describing. You just need to do a change the url for your upstream. The issue for me is that I have several forks of other peoples projects and in almost every case it's because that's required to make a pull request. For each of these projects that moves, they're multiplying the small effort by the number of people who need to move their forks and/or learn how to make pull requests on the new service.