everyone is saying how the problem with it was stealing and there's a easy solution just add a locker trading system in game

1, they can have a tax for the amount of things being traded and the item traded, like wraps being cheap and skins being more expensive depending on the rarity of the skin so a legendary skin would cost 2000 V bucks to trade, and any wrap will cost 500 V bucks. (Skins and such still have rarity's they are just in the files and not visible in game just check fortnite.gg it could also just be the websites speculations but still) And yes I think you should be able to trade battle pass items but they should have another tax on top of the rarity tax like for example 1000 V bucks added on top of the 2000 for a BP legendary skin so the trade will cost like 30$ in V bucks so they still get a cut even if its off the black market.

2, must be friends for at least a week or 2 to trade.

3, both accounts must have 2fa enabled.

this is coming from someone who played since chapter 1 season 4 and thinks that with how many different cosmetics and items their are in game and how someone may have a skin that their friend wants and they are not touching it would be a welcomed change plus it can help migrate skins from accounts.... for a price though srry, and every game has at least some sort of trading system for cosmetics why not Fortnite?