To answer a question: No, RYR does not anti-ice before locking up the aircraft for the night in CPH. They did, for 3 days in a row, sail right past the de-icing stands and went aviating, when everybody - and I do mean EVERYBODY - else had a spray of Type II.
Of course this is not at all economy related; all other operators in Europe are nutters and only RYR have seen the light when it comes to de-icing. After all, what does Norwegian, SAS and Finnair know about cold weather operations.*
* A spot of sarcasm may appear in the above.