Requiring users to write a profile that includes their employer's name is not something that is a Stack Exchange network policy. The only discussion I have seen about Stack Exchange control over what appears there is at Rules for Profiles.
As a focused Q&A site within the Stack Exchange network, GIS SE operates within its rules and policies, and while our users are welcome to advertise pretty much whatever they like about themselves there, I think to require them to provide any particular details would be against one of the pillars of what makes the Stack Exchange network different from discussion forums, bulletin boards, and other less focused Q&A sites.
Here it is the content (questions and answers) that is paramount, and so users are free to let the community know as much or as little about themselves as they wish.
If you see comments, questions, answers or chat messages that you feel contravene the Code of Conduct then I encourage you to flag those posts.
I believe that every person volunteering their time here, whether that be on behalf of an employer or not, as long as they are operating within the Code of Conduct and contributing useful content, should be made welcome. The elected moderators are responsible for dealing with anything that they notice or which is brought to their attention that contravenes the Code of Conduct. The community is responsible for assessing whether individual questions and answers are useful to the site by their voting.
Coincidentally, Let's hold language in comments to the same standard as posts, is a Stack Exchange initiative posted today for the purpose of holding comments to the same standards that we apply to questions and answers.
Also, if you see any sign of overt, and undisclosed self-promotion (or promotion of the offerings from a user's own employer), then that should be brought to moderator attention by using a flag too. However, you do not seem to be saying that this is a concern within your question.