The two most "unofficially modded" games in pinball history are TZ and TAF. TZ in itself has had over 40+ alone off my memory, including a few cool toppers. It is absolutely insane.
How do I know this?
These are the two games that started off the "mod craze" back in the late 90s, well over 20 years ago, and it has only gotten worse. The one single mod that defined this start was the TZ piano mod that came from a McDonald's happy meal toy around 1998-1999. The mod that defined TAF was "Uncle Lester" which first appeared around 2001-2002 in its earliest form. TSPP was not even around when the mod circles started, and has no where near the number of the above two games.
The STTNG PF photo was deliberately fake staged to poke fun at modders. It worked.