There's no way the government has the same resources as Facebook to make that case. The FTC loses when it goes to Court. Facebook would have more lawyers on the case than the FTC has paralegals total.
Where is that fundamentally different in other countries for very large (especially domestic) players?
Will Germany actually take a swing at Volkswagen? Will Germany try to go after those that defrauded the government with cum-ex-trades?
Everybody vs banks regarding the Libor scandal? Sure, they paid some fines, but the fines were far below the damage done, and it appears to still have been a good investment for the banks, that is: all in all they made money, fines included.