500px selling user images on Fotolia/Adobe Stock

[Dan Robinson]

..and apparently not telling the photographers:

I discovered this week that my 500px Marketplace photo is being sold elsewhere, and I haven’t gotten a dime of sales (yet). If you sell photos through 500px, this is something you should be aware of.

https://petapixel.com/2017/05/25/beware-500px-now-sells-photos-fotolia-without-credit/