No, I think they won't stop paying that fine. because they still have a great idea and have a lot of great partners in the liquidity service sector.
Why are they stopping when their businesses can make hundreds of billions of dollars in years to come?
Governments are stopping them because they can monopolised everything. After all Facebook is already huge and they can still grow bigger in the future if they released Libra coin. That's why at this point, US is targeting them because who would stop Facebook? So they are stepping up or at least tell Facebook that they are not in control here. If they are willing to pay that's fine but at least they know that the government is not closing their eyes on them.