I don’t approve of nerfing items that have been sold for real money. It can be very difficult to avoid though, mistakes happen.

At the least everyone who paid for an item should be offered a refund back into crom coins if it does get changed from the original specs. As to a battle pass item, it’s hard to value that in crom coins, but let’s say 120 coins (one increment of its built in refund) would be appropriate. The person loses the item but gets the refund if they so choose. This would be some amount work for them to implement though.

Bait & switch - op & nerf is a common complaint across many games. Make the item desirable so it sells well, then realize it was too desirable and nerf it. I don’t like that any more than any other paying customer would like it. I think what some games do with removing an item from sale rather than nerfing it if it is OP is arguably a better solution but that might be hard to apply here. This also serves the marketing people’s goals in that it creates FOMO for items that do seem good.