For me these are the three standout comments in Martin's superb article.
"What changed? Well, for a start, burden of proof. It moved from the league having to demonstrate a related party had artificially inflated a sponsorship deal, to a club having to prove it had not. And if it couldn’t, charges would follow on the grounds that “all reasonable care” had not been used to avoid this. So not just a block on the deal, but charges."
"When FFP was initially discussed it was to address debt, which would have hugely affected Manchester United under the Glazers. Then it pivoted, so the bogeyman became owner investment and putting money into football became a bigger crime than taking it out."
"Remember, it’s only dirty oil money when it’s buying players for City. Not when it’s sponsoring Arsenal’s stadium, or is the longest-running commercial partnership at Old Trafford."