Yeah I suspected this as a possibility, but do you have some kind of hard evidence on it? I do remember the case with the Nepalese restaurants last year tho, it was similar.

However, I would like to point out that this is a global phenomenon and I'd bet Finland has some of the least bad cases in this. Compare to some places like London where food is cheaper than Helsinki, but average salaries are higher. It's definitely about skirting regulations.