Most companies signing up to the idea that GitHub will fix their issues, rather than going through operational pain of migration. Everyone that I know jokes about GH downtime, but have zero internal talks about migration. Obviously small data point, but GitLab going this route shows not a lot of people are switching.
I've never actually seen that status page before, and I'm not clear what it's measuring. My company pays for Enterprise Cloud, and we see all the same downtime as what gets posted to https://www.githubstatus.com/