While some companies openly admit to using AI as a part of their sales pitch on their websites, some claim to not use the technology, without knowing that their writers are actually using AI to complete the papers without the consent of the company nor the student. Therefore, it becomes clear that the winner in this situation is the independent writer.
Generally, I agree with this, but students still need to be very careful, because I don't agree that there's automatically any basis for having confidence that an independent writer won't be using AI, just because he or she is an independent writer. The simplest reason is that most writers who write for companies also take as much independent business as possible; so, it's largely the same pool of writers.
The student can be fully assured that he will not be using AI to complete his paper. An independent writer relies on referrals to keep his business afloat, so lying about how the paper will be written will not be beneficial to him.
I also agree that, typically, writers have always been more conscientious about their private work than about their work for essay companies, because our personal reputations are much more important to us than the reputations of any company for which we might work. However, in the age of AI, you can still be fairly certain that any relatively new writer will be taking the AI shortcut, irrespective of whether it's for a private client or a company client. Therefore, the risk of inadvertently hiring someone who will just be using AI remains quite high in both cases.
That means it's even more important now than it already was -- for other important reasons unrelated to AI -- to make sure that the independent writer you're considering using has a very long and verifiable presence and history in the industry, and a reputation for providing excellent work that far pre-dates the availability of AI programs. A naturally good writer who has been doing this work quite well for decades is far less likely to change his or her writing process or to believe that AI might "improve" his work product than someone who just started doing this relatively recently.