The problem isn't with his knowledge, it with his ethics and the manner in which he treats people and those who are potential customers. He could have been completely the opposite of what he is not had he not let greed get in the way and become a total D bag. There is no doubt that he has acquired a significant amount of data and information, it is what he has chosen to do with it that is the issue.
I have no doubt that there are some that expected or wanted him to provide information for free, but i think the majority of people full expected to pay for his services, unfortunately he took advantage of way too many people, failed to deliver, verified cars that he should not have, etc. Had he an ounce of humility and humanity non of this would be an issue and he would be universally celebrated in the hobby. He chose his path, now he gets to reap the rewards.