Yesterday, we read at news about German banks will sell crypto in 2020

it looks good news at first sight but is it really good news ?

In banking system, banks keep only %10 or %12 of entire deposits of customers .

if you deposit money to any bank, they keep only %10 of your money and sell rest to other customers as credits.

If have gold accounts available at banks in your country. it is also same.

If you buy 10 gram of gold at your online banking, actually bank buy 1 gram and use your money equivalence to 9 gram of gold. 

It decrease the real demand to gold and it prevents gold prices go up more, so bank will not give more fiat to you for your gold account.

If banks will "sell" cryptos, how they sell in reality ? 

deliver to your wallet address or or just opening an account show you portfolio ? 

Banks possibly will offer crypto added funds or virtual crypto accounts same as gold accounts and will not use all money for buy crypto which customers deposited for buy crypto.

Demand from banks to crypto will be limited.

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