The Cross-Server Messaging states that one of its uses is:
Realtime Server Browser — Show a constantly-updating list of servers and who is in them.
That makes it sound like all servers can know about all other servers, leading to misunderstandings like this: MessagingService ‘Messages received for entire game’ limit is incorrect - #11 by lexandstuff.
Contrast with the clear limit given for the first example use:
Cross-Server Chat — Players can chat with each other even if they’re not in the same server, assuming a maximum of about 20 players.
I recommend a more accurate description for the second example, such as:
Realtime Server Browser — Compile a list of all the game’s servers and who is in them (updated every minute) and display the list on a maximum of 20 servers.