The hell is this?
This won't work, flat out. I assume that these individuals make Youtube videos about games. Now, presumably, they have reached a level of popularity at which they wish to make their own game to make Youtube videos out of.
I don't know what format their videos are in, but I assume that if you are watching videos on Youtube, you want some form of commentary and opinion on the game the Youtuber is playing. If they have made (or funded and helped design) the game themselves, they are clearly a biased party and unfit to provide an opinion on it.
I don't understand how this could succeed, so I have to assume that it's some form of cash in. In which case, it's a very smart plan. Youtube fame will likely fade away after a few years and if they have a large enough fanbase, I'm sure they can sell this.
The idea of asking people to Kickstart it is offensive though. Give us money so that we can make this Minecraft clone, cash in on it by selling it to you and reap the profits? I don't think so. They can probably fund it themselves anyway.