This is fascinating. I’m not sure if the comment about the specific psych tests they’re using is correct, but the overall ethical question is an interesting one.
As part of the DARPA serious games project I worked on, I implemented quite a bit of usability testing, some of which took place at the University of Central Florida. (A fabulous place for advanced game studies, by the way.)
Due to the university’s and the project’s human use requirements, I had to become CITI certified, which involves training in ethical human subjects research. Basically, Riot and LoL are effectively gathering human subjects data by implementing questions from psychological research testing. The ethical question is, are they keeping that player data secure?
However, questions from the Minnesota Multiphasic Personality Inventory (MMPI) and similar common personality tests have been part of human resource and other employment-related testing for years. Those answers have been part of workers’ employee records in filing cabinets all over.
Riot is definitely a ground-breaking company and is to be watched for their extremely smart community management strategies. This, however, is a thought-provoking question about online privacy. Can your answers to questions for a MOBA account affect your future somehow. . . ?

Riot_Games_logo

League of Legends is putting rule-breakers through psychological testing – report—gamasutra.com