Until today, I wasn't aware of the meaning of the word "dub" in this sense.The EI program divides the country into 62 economic regions, and where a worker resides has a direct and profound impact on how they fare under the system. The Mowat Centre EI Task Force dubbed the EI system a postal code lottery.
Cambridge defines "dub" as "to give something or someone a particular name, especially describing what you think of it, him, or her". Macmillan defines it as "to give someone or something a particular name or description, often a humorous one".
Example: She was dubbed by the newspapers "the Angel of Death". (Cambridge)
I have never heard of it used this way. Is this a common word (with this particular meaning) among native speakers? Will it be clearly understood to mean this particular meaning?