Huh? GitHub has had major outages practically every other week for a few years now. There are pages of HN threads[1].
There's a reason why githubstatus.com doesn't show historical metrics and uptime percentages: it would make them look incompetent. Many outages aren't even officially reported there.
I do agree that when it's up, performance is typically better than Gitlab's. But describing GH as reliable is delusional.
[1]: https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...