Taken from the press release:
OpenDomain.org acquired drupal.com at great expense, and in donating it to Drupal, has shown sincere altruism and generosity and has made a significant contribution to the larger effort of creating a great open-source software product," said Dries Buytaert, founder of Drupal, an open source content management platform. "OpenDomain's generous donation will enable us to extend Drupal's presence and facilitate continued growth of the Drupal project. We are very grateful for this contribution.
— Dries Buytaert