So their decision is because of a tech-stack switch (Cassandra to their own Manhattan)[0]. Redoing it in Manhattan apparently is too resource intensive and not enough users care about it for them to devote those resources to the project.

My guess is that they'll be back, but only if you pay for some service they'll offer.

I'm guessing we'll see how much of what @jack said about twitter being more developer friendly is now by seeing how long this stays up.

[0] https://blog.twitter.com/2015/hard-decisions-for-a-sustainab...