If this was about serving costs they wouldn't have terms like this in their license:
>LICENSEE shall use the Database and Data for the Permitted Use only and shall not disclose, release, distribute, or deliver the Database or Data, any portion of the Data or Database, or any other information derived from the Data or Database to any third party without LICENSOR's prior written consent.
> Or any other information derived from the Data or Database
How the heck are you supposed to do anything with it if you're not allowed to produce results that are derived from it somehow??
Maybe it just means you can’t get the data from them and then use it to sell an address verification service to others.