This is to mitigate the ease of retreat through wormhole after looting ESS.
The overall concept is a thief loaded with loot and dragged down by greed. The more you loot, the harder it is to escape.
SSC bond now has a mass penalty debuff attached per bond, equivalent to 1 battleship per 100 mil bond, rounded up to the nearest 100 mil. This will affect ship mass , agility, inertial, and warp speed, but more importantly will make it more difficult (but not impossible) to retreat into wormholes.