Let me relieve the pressure on your shoulders a little bit. The idea is not to see whether they are spying on us or not. If I go back to my money laundering example, from a corporate standpoint, from a financial standpoint, everyone who knows their field of work, financial experts, will say that incorporation is good and that they have to incorporate for certain activities. In this case, I find it awkward that this person, or group of persons, incorporated 15 companies. For this company, it's complicated for nothing.
When you look at what you find in your data, chances are that marketing companies do use these codes for their purposes. What suggests that it's fine in one field of work but not in another? One of the biases we have when we try to investigate something is that we put intent when there is none, but we don't see the intention when there should be one.
By practical analysis of the data, we can say that those data make sense, but in this case we don't understand why those persons use these types of data, because the context doesn't follow the purpose of the company.