[AdieuToLogic]

> API keys were invented as a tracking device.

Yes, by definition.

Apparently, you did not review the "Disclaimer" link I provided. In it is the following:

  Not all information or content on this website has been
  created or is owned by the NPS. Some content is protected
  by third party rights, such as copyright, trademark,
  rights of publicity, privacy, and contractual restrictions.
  The NPS endeavors to provide information that it possesses
  about the copyright status of the content and to identify
  any other terms and conditions that may apply to use of the
  content (such as, trademark, rights of privacy or publicity,
  donor restrictions, etc.); however, the NPS can offer no
  guarantee or assurance that all pertinent information is
  provided or that the information is correct in each
  circumstance. It is your responsibility to determine what
  permission(s) you need in order to use the content and, if
  necessary, to obtain such permission.

Notice the first sentence; "Not all information or content on this website has been created or is owned by the NPS."

Perhaps there is a need for use to be "tracked" in order to ensure legal agreement to the Terms of Use?

[AnthonyMouse]

That isn't a terms of use, it's a disclaimer. It's informing you that some of the information on the website might not be in the public domain, which is a simple factual statement that doesn't require you to agree to anything in order for it to be true or applicable.

[AdieuToLogic]

My bad, I thought of it as a ToS. Thanks for the clarification.