I think a moderator will be able to give us a good suggestion. It seems you and me both are making our own opinions based on our own interpretation of the forum guide.
A moderator, I don't recall his username, moved most of the exchange Announcements from Service Announcement to the Exchanges board. I think the idea was to have all Bitcoin related exchanges make announcements in the Exchange's board and the Service Announcement board would then be left for other services but the whole thing is conflicting to me.
We still have other exchange ANNs in service announcements.
When I read about the purpose of the two board. It makes what the Mod was doing even more confusing.
Service Announcements (child board of Marketplace) - "New services and significant information about existing services. Do not create excessive "announcements" just to advertise your service." All Bitcoin service website announcements should go here
Exchanges (child board of Service Discussion) - "Discussion about specific exchanges, Bitcoin ATMs, and Bitcoin debit cards. ". Emphasis on Bitcoin - discussions about altcoin issues on exchanges don't belong here.
To me;
Service Announcements = Announcements about different services, including exchanges.
Exchanges = Discussions about different exchanges