Skelleton ship will no longer appear in predicatable time frames and locations after the event is over. They want them to spawn at random in the world like the megalodon/kraken, because of this the only reasonable way for players to know that waves of skelleton ships are active is through a global note such as a "skull cloud". In any case there can be alternative methods to showing where it is, but in any case there still needs to be readability from players, especially if players seek to avoid running into them. There is nothing wrong with the server knowing where the skelletons are, especially because we have been knowing for 3 weeks their exact location and time of spawn, but now apperantly its a problem because a cloud flies over them?
This thread is a old sneaky "someone stole my exclusive fort loot, please remove the cloud" complaint, only its trying to remove the thing before its in the game. No sir, you are going to have to deal with the whole server knowing about the skelleton crews. Besides, server hoppers are going to have a hard time due to the sheer amount of resources required to face the skelleton crews, something that wasn't a concern fighting skull forts. Who knew that just making an event challenging would remedy the issues of players fiding easy ways to farm it...
I'd even would tolarete rare giving a screen message pop up letting everyone know where and when the selleton ships randomly spawned, just out of spite from this suggestion.