My imdb account has nothing to do with my personal Amazon account.
So there's only one option to sign into/create an imdbpro account and that is through AMAZON? What if a person doesn't have or want an amazon account or doesn't want it linked to their personal account? Are you forced to open or use an amazon business account? I have more than one company, and the one I have a business account for is a "retail" business that has nothing to do with the "services" business I have, which would not require an amazon account anyway.