In addition, if the CMC ranking is used as an indicator for choosing altcoins by beginner investors, then I strongly agree with you if that a big mistake. Because the CMC ranking cannot be used as an indicator for investing in crypto. It's will be useless if even the coin has high CMC rankings but in the end they become a scam. Beginner should also check historical data of CMC ^{(example snapshot link)} there a lot of top altcoins in the past, currently doesn't have any volume or doesn't have a market.