That doesn't work too much here for two reasons:
1. German consumers are notoriously averse to debt ("Schwäbische Hausfrau"). Most transactions pre-covid were in hard cash or using debit cards, credit cards are rare and American-style revolving credit cards even rarer (the debt incurred on a standard German CC will be fully deducted on the third workday of the month, no partial payments or payment targets). Consumer debt is mostly real estate, cars and financing for big-ticket purchases such as furniture or expensive computers).
1a. Additionally, German consumers and companies are even more averse to risk. Going bankrupt with a company (or personally) is seen as deeply shameful and something that is only reserved for the lower classes of society (which also explains, next to a lack of venture capital, the lack of successful global scale start-ups from Europe), and many shy away from stock markets and capital investment... it wasn't widespread even before the dot-com burst, but that essentially killed everything involving stocks as an investment methods to this day, so rather than to invest in ETFs people prefer to "safely lose money" in zero-interest "saving plans". And as 2/3rds of Germans don't have anything left over to save after making rent and food and Germany being a "renter market" instead of an "owner market" in real estate, they also cannot build up equity over the decades and generations.
2. Credit requirements: the European "Basel 2" requirements on credit are enormously restrictive. It's extremely hard to get approved for loans and to make it worse, it doesn't make any difference if you have done business with the bank as a known customer even for decades, the decision to grant a loan or not must be purely statistic/math based. This royally screwed e.g. farmers who suddenly had to put up their farm / equipment as collateral for loans for seeds, but also prevents lower classes from using (consumer) credit to invest in either outright consumption or into furthering their position in society (e.g. by starting their own company).