I disagree. Hive account@movietrailers didn't claim that they had created, produced or have any affiliation with any of these movies. The people behind these movies will be delighted to hear that their trailer has been shared on a social media platform that they've probably never even heard of.

Having these sort of posts becoming even moderatly popular on steemit is good news for the site as a whole. It will attract more users and more users means more people using steem and more people posting content. Banning these kinds of posts will have a terribly negative effect on the platform and alienate users that are more accustomed to twitter or facebook.

Steemit is a great place for long form, original content posts but I'm definitely up for having reposted movie trailers in my feed. They just got a new follower if I'm honest.

On the other hand, if you produce long form, original in depth posts and use your steem to promote it, I'm sure that if people find value in it, then it will remain profitable.