It need not be instantly due and there cash flow positive. 15b each per year and there done in 10 years and still profitable.
Also, free cash is hardly their only capital. Google could for example sell YouTube. They could also sell bonds or stock etc.
PS: Not that I think 300B is the right penalty, but there needs to be some real risks to prevent such behaviors or the penalties simply become yet another cost of doing business.
True but it seems hard to argue that the amount can reasonably be more than all of the cash on hand, since the companies wouldn't have been able to pay the employees anything like that amount, so it can't reflect the market value of the lost salaries.