Though it took me less than twenty four hours to be approved for an account, maybe because I was a high reputation blogger on another platform, it would seem the most logical thing to do to encourage participation is one person, one account. People should be required to prove to steemit who they are before getting an account. Steemit doesn't have to share that information with the world but it surely would cut down on the number of people who don't feel compelled to interact with comments on post because they have their sybil accounts to interact with....which, in reality, the reward just goes into the same person's pocket instead of the pockets of those trying to onboard. That and AI is going to be another big one shortly, bots programmed for years to interact in casual conversation, which some of that has been going on for awhile but it about to increase soon, very soon.