If the person I am referring to had not gambled in online casinos and invested this amount of money in bitcoins, he would have made a substantial half profit today, even after paying off his debts. If he had bought 1 BTC and sold it now when the price of Bitcoin was twenty thousand dollars, he would have made a profit of about 25K dollars even though he had paid a loan of 18K dollars. The reason for sharing this incident of my local elder brother is to warn users about the dangers of gambling.
I don't owe you $18K so we may not understand it but the one I shared with understands how heavy the burden of debt is.
In general gambling is easier to understand and understand but we need to learn a lot about Bitcoin including how it works and why Bitcoin is the investment asset of choice. So you just need to ask your brother if he has heard of Bitcoin before? If not, it means it is normal for him to gamble without having other options to gain profit. But on the other hand, if he already knows about Bitcoin in general but still continues to spend $18K on gambling, it means that your brother has agreed to the risks of gambling and doesn't care about Bitcoin investments.
We cannot dictate to those closest to us to invest, but providing them with the knowledge and goals of Bitcoin is something that needs to be done, the final choice is in the hands of each individual. Because the passion for gambling is greater than investing.