Based on my experience 'in the industry'
DCL ships have nowhere to land a helo - there is no SOLAS requirement to have such an area. In few cases will USCG land on a non-government vessel (I've seen it done on very large tankers where the helo pad was huge) In most cases the risk to hoist is lower than the risk to land on a vessel with which one is not completely familiar. Naval and CG vessels spend a lot of time ensuring helo landing proceedures are standardized and there are very detailed emergency response plans....this can not be counted on for a commercial vessel. {now someone is gonna say an XXX helo could land ... a CG H-65 nor H-60 could safely land on MAG or WON}
Vessels will have a designated/prefered hoisting area. The pilot of the helo doing the hoist will make the call as to where the hoist is made to/from however. With the ship moving forward ... hoisting from the stern is often preferred - but sometimes construction has not provided an open area back there ... the hoist needs to be done to an area free of obstructions. CG procedure will typicaly lower a rescue swimmer to the ship first, to run the deck to CG procedural standards. Safety first.
CG as an element of US government does not charge for a helo evacuation. However an evac does not happen just because someone asks for one either. A flight surgeon makes the call and then there is the question of if an asset is anywhere in range. An example - just this week a patient was hoisted from a cruise ship in the old Bahama Channel and brought to land. In this particular case USCG also provided a jet and the patient was brought all the way back to Miami ... very unusual as more often the transport is to the nearest medical facility - typically the closest hospital. I don't know the details of this case but obviously there were additional factors which justified the extra effort. "no charge" ... but if the patient had been xferred to hospital on an island, then stablized....then needed to arrange own transport via air amb back to US - stand by checkbook $$$$$
So just a few points - based on fact not opinion - to hopefully clear up some wondering