It seems that a lot of pilots do not understand the meaning of a true scab. Only an airline that is unionized is able to put out a hiring ban. A scab is a pilot that takes a position offered by the company against the opinion of its respective union. This pilot will take a job of a senior pilot' therefore this is not acceptable behaviour. A smart pilot would also avoid this because he will have many problems in the future with his colleagues, checks and possibly for the rest of his career.
Information on hiring bans are published for everyone at
www.ifalpa.org
Applying as a DEC for Emirates is not considered a scab. Emirates and all the other Gulf Airlines have no unions, they have however a seniority list which is most of the times honored. Should the company however need DECs for the expansion then they are free to do so.