What qualifications do you need to be a good writer?

This from Prospect Solutions: "....it is our company’s policy to accept writers with at least a 2:1 degree. This is not to belittle your capacity in writing, Prospect Solution is just committed to delivery excellent services to our clients, which is why we require our writers to provide us with a degree certificate in their specified subject area."

(I think they meant to say 'delivery of excellent services'.)

Surely having a degree in a particular subject doesn't itself make anyone a good writer; just as it would not necessarily make them a good teacher. Doesn't 20-odd years' experience count for anything? Aaargh!