There will be enough people already, at least at first, investors and bounty program participants can test and promote the platform. If, however, they connect an affiliate program to all this, I think the video from bloggers will be released in the shortest time and the need for an active advertising campaign will disappear!
video from bloggers never decide all problems. And it only one of many possible advertise channels. Large group of potential investors will be left out, if team will use only this channel. Besides, there will never be a lot of advertising