That's because for each (new) user the messages go in the moderation queue until a few of them have been approved.
That is probably a really bad idea. On the homepage, it says things like
Solus is an operating system that is designed for home computing
Designed for Everyone
. This could attract people that are not experienced Linux user (like myself), and hopefully it does. Though... you run into a few problems, post something in the forum and you are told your post has to be approved first. By the time your post is approved, you could be long gone.
I do understand the potential irritation, but it's not very welcoming for new users. Maybe you could prove that you're actually using Solus - spammers wouldn't go through the hassle of installing the OS, just to post something. I don't know how that should work, just an idea - moving on, is a easy as typing "best linux distro" in your search box.