that was a big tar file...

well I learned that git is really bad with tar files, so it doesn't need to be that big, but tiny changes over many commit can bloat the whole repo quite a bit 😬

Git is bad with any binary files. But GitHub supports GitLFS by default, so it is quite easy to migrate larger files to it - the personal quota is 1GB I believe. I have no idea how much it is for an organization.