OK, assuming the above is correct;
Each wallet within a digital currency is like a real world bank.
Each bank (wallet) has a "per transfer" charge to move its 'digital currency' to another wallet (bank) -- this charge is variable based on the byte length of the blockchain that this 'digital currency' is part of.
As an example: Each Bitcoin 'mined (created(printed))' or fractional unit of the digital currency, is a part of its own unique blockchain?
So, if want to move or withdraw fragments of 'Bitcoin' in aggregate the withdrawal (cash out to real money) might entail many blockchains and variable 'withdrawal fees'. So, it is not a set amount ...
Once you are in it might be expensive to get out ;0)
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