FWIW, our self-hosted Gitea instance has not had a single second of unplanned downtime in five years we've been running it. And there wasn't much _planned_ downtime because it's really easy to upgrade (pull a new image and recreate the container — takes out the instance for maybe 15 seconds late at night), and full backups are handled live thanks to zfs.
Migration to a new host takes another 15 seconds thanks to both zfs and containers.
I don't know how many GitHub downtime reports I've seen during that time, we're probably into high dozens by now.
I've been running Gitea on my homelab for a few months now. It's fantastic. It's like a snapshot of a point in time when GitHub was actually good, before it got enshittified by all of the social and AI nonsense.
I've been moving most of my projects off of GitHub and into Gitea, and will continue to do so.
Migration to a new host takes another 15 seconds thanks to both zfs and containers.
I don't know how many GitHub downtime reports I've seen during that time, we're probably into high dozens by now.