Agreed, I know it's not accurate to conflate steem with steemit, dtube and all but you seem to have caught the intent.
Though, I believe that Zuck had no interest in an established crypto token that was decentralized and open source. He had made a statement (or more) about making a facebook coin (not sure what happened since), that goal implies that, rather than buying something that would be open, that he was going to create his own coin tied to facebook in that sense would crush the intent of steemit (and minds).