"Don't be fooled by the rocks that ya got, JPM!" -- JLo
Some of these exchanges and metals warehouses need much better controls over what is deemed "good for delivery." Rocks instead of nickel? Not so much! Also, they need to get better at risk management in attempting to maintain an orderly market when dealing with customers/counterparties that are whales.
https://www.dhirubhai.net/posts/james-lovely-0a0516177_lme-nickel-hkex-activity-7047575728120320000-CtQC?utm_source=share&utm_medium=member_desktop