There's a good article a bit further back in the thread comparing Everton and why they're having to stay within FFP while it looks like the likes of City and Chelsea don't.
Short answer is those clubs don't just ignore it, their ceiling is higher because they have far greater income from the Champions League, sponsor revenue (shady as some of it may be), and their academies churning out players who've never been near the first team for loan or sale. Man City made £11m from Sancho's move to Man Utd, for example. Not sure about this season but it's not long since Chelsea had 30+ players out on loan. They'll all be generating income.
As Everton are finding, having the money and spending it are two different things.