Many organizations are happy to share large amounts of open data with the public, so long as they can clearly disclaim liability for members of the public using the data in unexpected or unintended ways. Items hosted in the ArcGIS Online Open Data Portal do already have a License field where such legalese can be included, but it must be actively clicked on by the user to view it. A disclaimer that can be so easily overlooked is less legally sturdy than one that users must actively click "I Agree" to acknowledge.
Based on all that, it would be very nice to have some ability to configure a splash screen welcoming users to the Open Data Portal and requiring them to agree to a general license agreement before proceeding to the data. Even for organizations that do not have need of such license agreements, it would be nice to have some sort of ability to post a splash screen that would be seen by people who follow direct links to pages other than the front page of the Open Data Portal.
