I bet that map has changed a lot in 10 years. Some sites have died off and others have sprung up. Steem is still tiny and not growing significantly. I have been saying we just need a few influencers to come over. Some of them could easily double the active users if a fraction of their followers joined up.
I agree 100%. Look at all the folks that @jerrybanfield brought over with him. Although he is not very active I am still getting automatic upvotes from him (well my posts are pretty good quality, if not interesting, most times).