Yes, although he still jumps in now and then to help them technically when there's an issue. Not that weird though as he really now how this stuff works.
Daniel was talking in the early days with Satoshi here on this forum. And he came up with Bitshares. After a while they created Bitshares 2.0 which can handle quite
some transactions per second. He used that technology to create Steem and the steemit website. It looks like a normal website but on the background it does use a blockchain.

And now the cool part: EOS will provide that technology to all app-makers out there. Not so strange that Daniel left these older projects, there wasn't that much left to do from bug-fixes.
EOS will bring us over a million transactions per second on 1 blockchain only. They use Delegated Proof Of Stake:

https://steemit.com/dpos/@dantheman/dpos-consensus-algorithm-this-missing-white-paper

Give it a read, this one is not so hard.