It's not possible to "fake" cryptocurrencies. It is however possible, within exchanges, to credit accounts with funds that they don't have and only appear on screen, on the exchange. So yes, it's possible for bots to mess things up (we've seen this happen), but not with "fake" cryptocurrencies.
yes I agree I'm sure you cant counterfeit cryptocurrency as each one as to be made so and I'm sure site might try to sell more cryptocurrency then they have but I don't thing counterfeiting this type of currency will be possible any time soon.