Grotesque Souls were relased on 27 january. Players could get them from Treasure Hunter or doing slayers tasks. Players could trade them on GE, between players and in general store.
GE medium price was: 7000
Store price was: 2100
Real market price (player to player) was lower than 2100.
Some players found out they can buy souls from other players and sell souls to general store for good profit.
Couple hours after relase Jagex removed ability to sell souls to General Store and banned players for bug abusing who were selling souls to shops.
Jagex mod said on reddit about bans:
To clarify the stance on the Bug - we've never allowed promotional items to be sold to the store
In past there was TH promotional items that players could sell to store:
pinata sombrero: https://embed.gyazo....59f5fa4c26b.gif
pinata plushie: https://embed.gyazo....5cb59f568ab.gif
relased: 14 December 2015, still sellable on 02.02.2016.
So there was no way for player to see it that selling Grotesque Soul to shop was bugged because it followed rules of old content that was 100% legit at time of Souls relase.
This create situations where players can be banned for playing new content and be banned because of jagex mistakes.
Why there is no bigger discussion about Grotesque Soul Bans?