These accounts are indeed free, but not without burdens. You need to give your address and agree to a bunch of terms in order to gain access at all, and then each time you request access to a specific piece of data you need to provide a justification and agree to another set of terms.

Interestingly, among those terms are:

> 1.3. not to use this Data, nor permit this Data to be used for any marketing purposes whatsoever.

I think the intent is to prevent the data being used for bulk mailing, but there's another section, 1.1 that specifically bans this. Choosing a domain name for a business is arguably marketing, so it seems that a close reading would disallow this.

I mean, of course, this is all unenforceable BS anyway. I'm surprised that someone hasn't gone ahead and taken this data and put it up on github or something; it all feels very theatrical.