Probably has happened at some point, but personally, I have not been hit with/experienced downtime of Codeberg yet. The other day however GitHub was down again. I have not used Gitlab for a while, and when I used it, it worked fine, and its CI seems saner than Github's to me, but Gitlab is not the most snappy user experience either.
Well, Codeberg doesn't have all the features I did use of Gitlab, but for my own projects I don't really need them either.