GNCollective

This absolutely isn't the case with the BETA product (TownStar) already available for free play on the Gala Games platform if you want to check the implementation.

Whilst I agree this may not necessarily be put into practice by other games, Gala Games is also said to be using select NFT items across multiple games in their platforms too. They have already demonstrated collaborations with other games in the blockchain space so it wouldn't be too far fetched to imagine that a sharing of NFT between partners might follow.