You could say that anything is "gambling" really, because nothing is risk-free.
Starting a business is gambling, because it might not do very well. Leaving your money in a bank is gambling, because it might go bankrupt and lose your money. Buying foreign currency is gambling, because its value might plummet as soon as you get it. Not buying foreign currency is gambling, because the value of your own currency might plummet. Et cetera...
I think the Islamic prohibition on gambling is in reference to things like betting all your money away in a casino where the odds are deliberately stacked against you, and the thing you're betting on (e.g. the spin of a roulette) has nothing to do with the underlying value of the service you're providing to or receiving from anybody.