Which early adopters exactly? The most prominent example they gave is ghostty which has existed for just a couple of years, notwithstanding the fact that the owner published a spiel about how he's personally been using it for longer.

An early adopter is someone who is first in line to try something new, usually because they're willing to part of the new thing with their own hands. Just look at what projects are on any of the third-party forges, those are the early adopters of post-github tech.

I would also be one of them, but I'm not actually off Github yet. That's because I haven't quiite finished building the thing I'm going to move to.