My sense is that any projects willing to move from GitHub to gitlab on a Sunday evening because of a rumour that GitHub was going to be sold were not really serious projects and losing them isn't a big loss for GitHub.
At first it was hosted on http://peterburk.free.fr, my parents' ISP. That was fine until I no longer lived with them, and I can't trust that it'll always be available. Also, I wanted a .com subdomain instead of a .fr domain.
So in 2011, I moved to http://peterburk.appspot.com on Google App Engine. No problem, until I moved to China in 2013. All Google services are blocked there, including my page. So I migrated to http://peter-burk.rhcloud.com (Red Hat OpenShift). I didn't like the mandatory dash in the subdomain, so I also set up http://peterburk.tumblr.com to redirect. RHCloud supported PHP, so I could finally run WordPress.
Then RHCloud changed to being paid-only, so in 2015 I moved to https://peterburk.github.com and couldn't use PHP again. Now I code everything in client-side JavaScript and static HTML. More recently, Github removed the .com subdomain service, so my Chinese-learning side project is https://pingtype.github.io and that confuses some users. If something happens to Github, I might try to hop to heroku, but http://peterburk.herokuapp.com is pretty long to type.
What do other people do for ad-free hosting? I think most sites pay for AWS, but I can't have a credit card because I'm a foreigner. The design of my site is very basic, because I've had to re-write it 4 times already, typically every 2 years. I choose technologies based on the platform features, so I did know all about GAE, but now I'm more familiar with Git. My loyalty isn't to the code management tool (this is for side projects, not a business that would need collaboration with colleagues), I just move to wherever is free/not blocked by China/has an easy-to-remember domain name.
By your own domain a $5/month VPS and host your apps just the way you like it.
Just 10 years ago, geeks like us used to take pride in buying domain and creating a personal presence with one's domain name. Don't people do that anymore?
I find this trend of looking for free hosting services a bit disturbing. Because you know the cliche that when you are not paying for a service, you are the product.
Even if you do not want to buy a $5/month VPS, please buy the domain. Costs less than $1/month (more like $10/year) and point the domain to your favorite free hosting service with CNAME entries. GitHub and Heroku support such custom domains with CNAME entries.
https://www.gnome.org/news/2018/05/gnome-moves-to-gitlab-2/
ok. so they weren't on github. GOSH!
Nat was a cofounder in the same way that Jeb Bush was a US president. Connected to one perhaps but not one himself.