When a writing company claims to have over 700+ writers who are deemed as "experts" in various fields, I tend to see this as an exaggerated claim that means only one thing, the company does not provide quality writing services. Why? By admitting that they have writers based worldwide, that means the majority of their writers are ESL, which can only mean that any ESL person can work for this company. They do not care about the educational attainment of their writers, or whether they can actually write in a field that they claim to be experts in. They just care about keeping the seats filled in the writer's pool. Nothing more. I would not deal with any company that tries to convince me that their global writers pool is not composed of ESL non-professionals misrepresenting themselves, trying to write about topics they have no true knowledge and hence, skills to write about. in any manner.
The opinions are that of the author's alone based on an individual capacity. Opinions are provided "as is" and are not error-free.