Their movement could no longer be hidden in some places but ironically the World government and the Republic didn't have the time or the manpower to surveil them and they didn't really care for those few weak factions went to sail the sea.
They saw it and determine it to be something that does not require their attention
If they share information and learned that the entire seven seas of the world burst into activity, they would not be so calm.
The World Government is trying to establish contact with Pandemonium sending messages only to be obstructed by Sasha telling the representatives of the World Government that Death Monarch is in seclusion.
There is also the matter of the Orvanian. Sith'venar and Sith'venar express their desire to meet Death Monarch.
After all, Death Monarch did just capture Sithulran. The awkward thing was where did Death Monarch send Sithulran?