It's simple, Cryptocurrencies is not the same as Fiat in terms of stability of price, Consider Crypto now as stocks in the stock market. Many people are diving on crypto which you can see on Coinmarketcap that BTC dominance is diminished and it means that many BTC holders/New Comers that bought BTC diversify their money into altcoins which results in skyrocket. I agree that crypto is a gamble but take note that all activity that involves money is gambling too even the traditional business investment that we know.