Just like any other FOSS project:
Devs chose a repo of their choice, the distributor (in this case Nexus) choses a repo (GitHub is either free or very cheap for FOSS projects) to check for compliance, vulnerabilities, etc and then it's cloud natively packaged for distribution.
This is how Flathub, Homebrew, and the Universal Project distros are built and distributed.
I bet Nexus would save a ton of money if they went this way.















Really ? That's great to know. I'll give them another look then.