> on a long enough time horizon Gitlab or other provider isn't significantly better

I suspect the same. But do you have any evidence for this? The status pages of Github and Gitlab (more precisely their history pages) don't seem to be a good starting point for comparisons. Anything I find online are people reporting their own experiences, and it's difficult to tell how accurate they are, how many users were truely affected etc. The only thing I can vouch for is that Github has got more unreliable - adding to the hearsay myself...