No test measures intelligence. A test only measures you relative to the persons that wrote the test. – loosely quoting Asimov.
2007 is ancient history now. It is an interesting graph that one might correlate with a lack of meritocratic structure in society, but I’m on the low end cause I say this without looking up and reading the study. Pretty pictures evoke emotional blabbering bias and all that.
Anecdotes aren’t evidence, and we all have anecdotes, but a counter anecdote would be I have seen people who take unethical choices experience reduced income due to loss of job offers, dismissal from existing jobs, criminal penalties, loss of contacts and relationships.