People who has mints stocked up, have had them in an unfair advantage way.
People stocked up on legendary birds / celebies while now you are limited to only a few per player.
Probably a alot more examples which I do not know about.
This is simular advantages as dupers have. They get ban? nooo
I personally had like 50 celebies stacked up before shrine nerf. Could consider it very unfair, as they hold a base price of 2.5k +. Sold almost max IV celebies for 20k+ on shrine nerf.