It isn't. No evidence has been presented to that effect. Here are some actual numbers[1].

(The classic form of griping over NYC corruption is the MTA which is notable for not being administrated by the city.)

[1]: https://www.vitalcitynyc.org/articles/how-corrupt-is-new-yor...

Why do people say NYC is more corrupt? I don't know of evidence or reports. To me, it doesn't seem more or less corrupt than other major cities in the US. It's hard to compare to other countries, where city government may have different roles.

Certainly NY's government and budget are larger than other US cities, for obvious reasons.

They are just as corrupt and/or incompetent. Have you tried Deutsche Bahn recently?

If you think Munich isn't corrupt, you should ask a Münchner - hell, their airport is named after a corrupt politician. [0]

But as a few Germans have put it to me - sure, there's corruption here, but at least it still gets things built unlike _Italian_ corruption.

Which is an... ...interesting point of view.

[0]: https://en.wikipedia.org/wiki/Franz_Josef_Strauss

As for London, they built an entire industry around hiding money for oligarchs who stole it from their own countries. Maybe it's technically legal, but it's morally corrupt AF.