Announcements is only for Ludia staff (mods, devs, etc), so each post is important. There is no user content.
Tournaments is mix of mods and user content, so news about new tournament is burried under user content.
So either put tournaments announcements in Announcements or lock Tournaments for users.
And just a note: seems like tournaments announcements by random goes to channels (part is in Announcements, part in Tournaments).