That surprised me too. Large companies here in Central Europe are subject to constant scrutiny by external firms, especially in the financial sector. I simply doubt that billions of euros can disappear here "just like that".
I also find it interesting that Wirecard has outstanding loans totaling 1.75 billion euros with renowned banks:
Translated to English from this source.
If you know how exactly such sums are checked when granting loans, it is remarkable that Wirecard was able to deceive the lenders to such an extent. Such verification procedures are absolutely no child's play. In order to obtain these sums, a high degree of criminal energy must be involved in order to simulate investment potential where there is none.
But the little man is warned against Bitcoin and co. ...