It can be hard to build but it can on all of them! A lot of it is what you put in to it. A lot of my friends who I got signed up to hive or steemit all quit as they only made cents for ages or witnessed all the downvote wars. The same ppl some have sly stuck it out on blurt and are loving it as they got a lot more activity much quicker. I think all the sites can have a bit of a barrier to entry at the beginning but I think blurt is the best of all of them of helping retain new members personally. I do sometimes see ppl not getting rewarded here but then I’ve often made a post to highlight them and ppl have stepped up to the plate. I’ve even seen people just randomly give people money here! I mean the only down side is all the vote weight is in a small handful of wallets I think it’ll be easier to support more ppl when there are more ppl with good upvote power.