Warm welcome to the forum; the first sight of your announcement thread is really cool. I hope the service of your platform will be really cool too. I just won't agree with your explanation regarding the self-moderated announcement thread. The announcement thread is treated like a public discussion thread. So users will share their experience on this thread. And you shouldn't moderate it anyway. Discussion would go positive or negative about your platform. If it went negative, how do we know you haven't deleted it? I know there would be some spam; if it's pure spam, you can report it to moderators. They will handle it accordingly.