CIC did, there's lots of info already on the forum on that subject and 2 of my friends have been sent home and had their applications for PR cancelled because they were working while they thought they were on implied status. Even the CIC call centre is unreliable on the info they give as it is a matter of who you will speak to but if a deportation order is made, then there is nothing you could do or say on the matter.
There has already been a written response by CIC to a member here as well, clearly stating IEC doesn't benefit from implied status, which pretty much closed the whole subject. I don't remember the name, other members might.