3. Copyright and Limited License
Steemit contains data, text, photographs, images, video,
audio, graphics, articles, comments, software, code, scripts
and other content supplied by us, the Steem blockchain or
our licensors, which we call “Steemit Content.” Steemit
Content is protected by intellectual property laws, including
copyright and other proprietary rights of the United States
and foreign countries. Except as explicitly stated in these
Terms, Steemit does not grant any express or implied rights
to use Steemit Content.
tl;dr no :-/
No one owns it. It is on the blockchain public data base. Steemit is just a user interface.