500px 被 视觉中国 VCG 买了。下架了 CC 协议。

https://www.theverge.com/2018/7/1/17521456/500px-marketplace-creative-commons-getty-images-visual-china-group-photography-open-access

> the shift was that they weren ’ t seeing a lot of activity with Creative Commons images, that they still had a number of bugs when it came to searching for such images, and they only had outdated licenses for photographers

解释居然是 CC 过时？我日。