It is normally when you pass a certain limit.
It is obviously not practical for them to ask customers for this on sign up as few would proceed to sign up I guess, but you can be sure their terms and conditions provide for them to ask for it when they want......and best time to get somebody to comply with a prove your id request is when you are holding their money "hostage".
If you are concerned about their intentions with your documentation, just ask them what they will do with it.
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