Yes, they are. I know all four blockbrothers very well. My son @exyle of course, but I also know his three friends since they were children. They are dedicated men and very community focused.
I use their app Steemify every day and I know they are working on more applications for the Steem blockchain. Of course, I am a bit biased because I am exyIe's mother but he is so dedicated, almost too, if you ask me. He is a great supporter of the Steem project and will do nothing that will harm it in any way.