On personal note about your post.
Regardless of that monoristi issue it is an interesting post but you forgot to add one crucial and probably the most important point.

You DON'T get paid on reddit (or FB or Twitter, etc) for posting, commenting etc...

Also, none of the users are in a way shareholders of reddit. They have no profit or stakes from/in it's value, even if it is worth billions of dollars.
In Steemit, it is the opposite.

Also, as you know, Steemit's reward pool is limited. So exploiting certain curation with spam take rewards from any other Steemians that have been putting effort and work to create worthy and creative content that supports Steemit's "Proof of Brain" concept.

Steemcleaners explained it here:
https://steemit.com/utopian-io/@steemcleaners/understanding-flagging-downvoting