Greyball seems like the one aspect of this that contextualizes the rest of the reasons for the non-renewal. If you're an operator and you fail to get right by local rules, you might mea culpa and fix it, or work within the system provided by the authority to do better. In this case, TfL were made aware that an operator had operationalized a program designed to help them skirt regulation, which could have inspired some prejudice when it came down to the decision.
On a broader note, as with all Uber discussions, we will get to the pained point of unfair treatment of Uber by incumbents and regulators. Contrast that with the general SV ethos that one should break the rules to win. Given both of those, would it be fair to say that Uber getting chided and blocked here (and there, and there, and there) is an indication that maybe they're not that good at breaking rules? In other words, who is out there succeeding who is under the radar and is not being scorned for a cavalier approach to rule-breaking?