Fast money what? You mean fast losing money, right? because that is how gambling works, most of the time you lose, and you are only winning in the first try because the House is just convincing you that you are good are it, for you to be addicted, and if are get addicted to it, you will never quit gambling because you have a mindset that you won't quit until you win back all the money that you have lost, sadly, you didn't.
That is why it is correct that it is better to invest your money or bitcoin, but, you must choose where to invest it, and for me, Investing it in the casino is not worth it. Yes, it do has a smaller risk compare to gambling, but your money is still in the Gambling site, so, I could say that it is not that safe.
And just like what you have said, Investing bitcoin on Trading, for you to earn money in the safe way unlike gambling is true. But, there are also risks in Trading that you might face if you don't know what to do in Trading, you might lose profit if you are not patient enough to wait until the right time comes where you can sell and buy Altcoins that you will trade, and you have to be careful on buying Altcoins because some of them are not lasting for too long.