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What happends to the ID of the user after its deleted
I was wondering what happends to the ID of the user after its deleted. Does the ID get whitelisted or can someone else obtain it with pure luck? And if so how hard would it be to get it with pure luck
TL;DR
The user is asking what happens to a user's ID after it is deleted. They are wondering if the ID gets whitelisted or if someone else can obtain it with luck. The response explains that IDs are randomly generated and the chance of collision is extremely low. Therefore, it is highly unlikely for someone else to obtain a deleted ID through luck. Solution: No specific solution provided. 
The chance of colission is practically zero
Actually, IDs are randomly created. So if you are using unique() to make IDs, chances are very very very rare for this to happen and even if you are creating the ID yourself, this is highly unlikely
Here is how those unqiue values are calculated.
