Doesn't matter - same with github. If you don't want to use their service, you stop.
It's just like saying, I don't want to list my phone number in this phone book. Doesn't make your phone number any less valid.
Github sells private repos.
Sure, but my point is that if key base folded, there's nothing inherently "key base" about any of the underlying data. You still have your key pairs and can put them up somewhere else.
There's almost zero impact to you if they shut down.
The creators founded/exited SparkNotes and OkCupid. I don't think they are looking to be aqui-hired.
That doesn't mean the site doesn't need a sustainable business model.