Brew temperature != serving temperature. Everywhere brews their coffee at near boiling temperature. Only McDonalds stored and served it at that temperature. And nobody drinks it at that temperature because it would instantly scald your mouth.
And in fact most coffee snobs will tell you that keeping coffee at high temperature for any longer than necessary is bad because it causes stale and burnt flavors. So they were actually making their coffee worse. And what do you know, after they were forced to turn down their temperature, they have started promoting how their coffee is not terrible any more.
So in reality, this lawsuit probably made McDonalds millions of dollars in sales by forcing them to stop serving stale burnt coffee, which made more people want to drink it.