Just recently a few months ago. Just try uploading and downloading more than once, then it gives you a 3 hour limit before you can download again. Upload limit there is none of so you can upload a ton of times but you can download only once every 3 hours.
This 3 hour limit makes abusing crystals through the upload download abuse pretty much useless. The only people who could do it is by rooting and even then, not everyone knows how to do even that method.
Save scumming kept to a minimum which is great.