I was there before 2018, their reliability was never that good.

I still remember that they launched GitHub Actions in 2018 and back then I was thinking: They can't even make the website reliable, surely this will only cause them more problems.

This site's trustworthiness when it goes for pre-aquisition data was disputed here already:

https://news.ycombinator.com/item?id=48086786

Fax. Those falling for the load/capacity excuse are gullible.

GitHub's historical uptime page is fake, they backfilled it with 100% uptime going back to 1996: https://www.githubstatus.com/uptime?page=200