It is free for use in this sense:
"GIFAnimations.com is a free web site where your collection of art images and backgrounds get worldwide exposure in the form of downloadable files. (Let's pause briefly to explain the meaning of free. You don't pay to display them here, and people don't pay to use them. It's a win/win where nobody gets rich and nobody goes broke.) Post your stuff here and it can show up in places you never imagined. Clear around the world in cartoons, videos, banner ads and more. Get the picture?"