If the EU Commission proposed the appointment, then it's a safe bet the commission itself is captured/corrupt. Very corrupt, given how outrageous appointing a non-EU-citizen to a high-ranking EU political position is.
It has been for quite some time (at least it was already dragging this reputation for the EU constitution referendum in 2005).
To the point that the schematic vision for EU organization is the EU parliament expected to represent EU citizens vs. the EU commission expected to defend private interests.
And Ursula von der Leyen has a horrendous track record when it comes to doing anything remotely positive. But having Margrethe Vestager defend this appointment was more of a letdown.