They stole the SteemIt's stake (worth millions). It's currently being redistributed to them (blocktrades & friends) through the proposal system.

The keys page has been improved since then. There's also an help page now :

Your testnet DTCs are gone forever yes. If you are eligible for airdrop, just login with both steem and dtube accounts and check in the notifications menu. You probably are eligible if you ever used / upvoted dtube content in the past on steem...