As Richard Dice, president of TPF says, "booking.com has demonstrated extraordinary vision and community spirit," but they also know that their infrastructure needs ongoing support. Their IT team is 50+ persons, and Perl is the "language of choice."
Thanks to booking.com for this donation, and let's hope it is part of an ongoing trend. Now, if only TPF could get, say, $5 from every company that used Perl. Think how many programmer-years that could buy to help get Rakudo out the door.