How to use GitHub as a pastebin/file-sharing without increasing your repo size or eating away from your free quota

github_for_file_sharing.md

1. Create blob using API and extract its URL from the response using jq '.url'
2. Give the URL to anybody you wanna share the file with. All he needs to do is download

Since no commit is pointing to the blob, it doesn't present itself in your repository history and therefore, doesn't increase repo size.