https://www.cnet.com/news/500px-photo-site-abandons-freely-shareable-images-with-commercialization-push/

500px, a photo-sharing community that's been transforming into an image-licensing business, has backed away from a framework that let people freely share their photos with others.

On an FAQ website updated this week, the company said it's disabling the ability for people to upload or download photos shared under Creative Commons licenses. That framework lets people share images without many of the usual restrictions of copyright licensing, which is why Creative Commons licenses are so useful for sites like Wikipedia that rely on free contributions.