"In reality, the FTC can't impose a fine that would effectively put an American tech goliath out of business"
Um, why not? If Facebook have done enough illegal nasties that they 'could face a fine that totals "more money than there is on the planet."', then they really should be stomped into the ground very hard. This is "make an example of them" territory, so that no one tries it again, thinking "hey we can make mega profits doing what Zuck did".
I'm guessing the answer is that an American tech goliath has paid enough American dollars to enough American politicians...
Nuke 'em from orbit, on live TV / radio / Facebook streaming, etc.