Not sure how useful tool this is for promotion, unless it grows its userbase to rival something like twitter or facebook. Otherwise youll just have extremely limited exposure through it. Even with censorship, I feel most people gravitate towards facebook/twitter/etc simply due to the fact that everyone else is already using those platforms. On other hand, I am not dismissing that this could grow into platform for some small subculture that would get censored from bigger platforms and if you want to advertise to only such people and don't look for wider audience, then yeah, it might work for you.
