I only did for my last semester mostly as a practice for using git and to have something to show recruiters/employers.

That’s a poor excuse. If something is secret or higher it has a different TLD. The SIPRnet uses .smil for example. There are also tools at the boundaries that don’t allow going from SIPR to NIPR unless they meet specific criteria. Basically you can only leak those secrets accidentally if they were already on a system they shouldn’t have been on.

And you spread that server load by selecting different servers. While what you’re saying is technically true, in a practical sense if everyone picked a more local server that would be one way to achieve what you’re saying.