It`s not stealing,
How can you steal a item from someone that is not anymore in the game ? When someone disconnects or leave the game, all he`s inv, gold ecc - belongs to the team.
Now it`s up to the team what they will do with it.
Exsample: If you have a leaver and the game becomes 4 v 5 - 3 players vote, decide to share-take leavers items, 1 objects, 3 > 1 , items are shared and 1 player is dissatisfied ecc.
If you are still confused about this situaion be free to ask. Cheers