Any banning of ships that aren't inherently unlawful or very obviously military capital ships should be stopped. Cruisers, Battlecruisers, (military) Carriers and Battleships are obviously something to be limited to each house's military, and unlawfuls obviously don't care about restrictions, but banning gunboats, frigates and stuff like the Bustard, Bulwark and co. is just a perfect way for empty houses to make sure they stay empty.