They love to be essential and central even if it costs them. Same reason why they won't ratelimit 10000000000000x consecutive requests from the same source on the same resource on npm.

No, services that lean too heavily on Github routinely receive messages from the admins asking them to do what they can to dial back usage of server resources. It happened to Homebrew, it happened to Rust, and it happened to various other projects who thought they were being good citizens by recommending shallow clones (turns out, shallow clones are somehow harder on the server than full clones).