They're all as bad as each other.
And all the other clubs would be as well if they were in their position.
The only way to fix it is by a strong central organisation imposing rules that promote fair play and equal competition.
Everybody is fucked, in other words.
Maybe this is the opportunity for City to go hard, legally speaking, and bring the whole corrupt edifice down...
Seriously, though, it would be interesting to know who is really pulling the strings here. As Gabriele Marcotti points out, nobody knows who this 'John' character behind the Football Leaks emails really is, nor the extent of his links to 'cyber criminals.' However, the really interesting thing is the politics, which probably go much wider than football.
As for the football politics, as a small minority of journalists (well, just one really) are pointing out, the cartel clubs didn't want to be challenged, so first they banded together to demand the anti-competitive, laughably-named FFP. Few clubs are capable of matching City on the pitch, so now, whoever is behind the supposed leaks, they see their chance to get what they wanted in the first place and use faux outrage to impede a rival which has done exactly as they feared and bettered them-no matter how much they spend themselves-within a relatively short space of time. Of course, at the bottom of all this is the money factor. The CL was meant to be a de-facto closed shop, with the same cartel clubs always reaching the final stages thus maintaining a monopoly on the money, in a self-serving, self-perpetuating circus. New arrivals to the party have reduced the multibillion cashflow they assumed permanent.
And note the media collusion: City's guilt is already assumed, solely on the basis of articles based on emails that nobody in the UK media (and the shrill, frothing manboys on social media), has seen.