yes there are some blockchain blogging platform arising lately like SCORUM and UNO these are blogging platform. scorum is only for sport post and they are also trying to start beating platform so may be they will try to competition with steemit in future. second one is UNO best thing i like in this blogging platform is they have mobile app and its so user friendly. both platform are arising lately so they needs to take time for popularity but if they make strong community then they will be biggest competitor for steemit. its not easy to competition with steemit bcz steemit is first blogging platform on blockchain and first is always take place in our mind. i have just shared two competitors may be there are some other.but steemit is my fav and i know it will be best platform in near future.