Official restore codes can typically be used only a limited number of times per year (often up to 10) to prevent abuse. The Truth About "Unlimited Gems" Restore Codes
A (also known as a transfer number) is a unique, persistent identifier linked to your specific game account. Its primary purpose is to allow you to transfer your progress between devices or recover your account if you delete the app.
There is that provides unlimited gems. The "restore code link" query often leads to scams or "modified" accounts that come with significant downsides: Restore Data - Neo Monsters - ZigZaGame Forum