Comment by Nextgrid

Hard disagree.

Self-hosting a service like GitHub that operates at GitHub scale is difficult.

Self-hosting a service like GitHub that operates at the typical small/medium company's scale is trivial.

A single machine (with separate runners for CI) will cover many companies' needs. It being a single machine eliminates a lot of the complexity and failure modes associated with a distributed system and makes backups/restores/maintenance easy.