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How can 1 man own this network?!

$$$ + Contacts at exchanges.

Aha! Now I understand! So, he apparently bought a huge part of STEEM & SBD?

He bought Steemit and the ninja mined stake, not Steem the blockchain.

So, the founders of Steemit & the starters of the platform sold it or?

Just Ned.

Let's just hope that the new co-owner will save the concept!

No such luck. Best bet is to join the fork that's happening and leave this site to Justin Sun and his centralized sockpuppet witnesses so they can convert all these tokens to Tron tokens.