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You're inferring way too much from a couple of failed investments.

Wirecard was the biggest bank of the 4th biggest economy. So I inferred some systemic issues here.

Isn't Deutsche Bank the largest bank in Germany?

Right now it is again. Deutsche Bank has a market cap of around € 17 billion, Wirecard has (as of writing this) around € 3 billion.

for size comparisons: banks are typically compared by the sum of their assets (not market cap)

Biggest by market value - and that‘s because it was considered a tech company rather than a bank.