Information about work assignments and how these are assigned can normally be found in either the FAQ or Writer's section. They may name this section something else on their site but it is readily available information. Google maybe a good place to find the assignment criteria directly but may not be easy to find via search because the company may not have been made searchable. Some companies consider that internal information, making it unsearchable. The best beti n finding the answer would be to email writer support and ask them directly. However, Cite has provided a good overview of the assignment process.
The opinions are that of the author's alone based on an individual capacity. Opinions are provided "as is" and are not error-free.