Ease of maintenance is an even bigger difference. We've been using gitea for a bit over five years now, and gitlab for a few years before that, and gitea requires no maintenance in comparison. Upgrades come down to pulling the new version and restarting the daemon, and take just a few seconds. It's definitely the best solution for self-hosters who want to spend as little time as possible on their infrastructure.

Backups are handled by zfs snapshots (like every other server).

We've also had at least 10× lower downtime compared to github over the same period of time, and whatever downtime we had was planned and always in the middle of the night. Always funny reading claims here that github has much better uptime than anything self-hosted from people who don't know any better. I usually don't even bother responding anymore.