The problem is that there are a number of self-anointed police groups on the blockchain. In fact, anyone who can rally people to a particular cause can create such a group. Most of these groups are at least well-intentioned, but you know what they say about the road to hell... For instance, Steem frowns on reposting content from elsewhere, but much of the interesting discussion on other social media sites happens around such content. For instance, I spend more time on twitter now than steem because the AI and machine learning posts constantly point out new articles and papers--none of which are published on twitter. However, once these are posted on twitter, interesting discussions, often of leading experts, take place there. Steem lacks this, except for posts that are about Steem or hard forks. I believe that this, combined with the fact that there are very few people on Steem compared to other social networks is why it is hard to attract and retain new users.