Version 1.3.3 of Personal Data Broker adds a json template in the static directory and route in the server for communicating with 21.co about your 21-specific preferences. In particular, it adds the following fields: betas_pls, organizational_deployment, and wishlist. Now, if 21 is so inclined, they can crawl all their user endpoints and find who is interested in testing betas or deploying 21 in large organizations. The wishlist of course is just that.
21 buy pagekicker/personal-data-broker/buy/for21