For starters, Yaesu has no control over FCS and YSF servers. They are independent of the Wires-X system and Yaesu would really prefer they weren't connected to Wires-X at all. Wires-X rooms (for the most part) have good descriptions. Look at
https://www.yaesu.com/jp/en/wires-x/id/active_room.php
for the active room list.