Yeah you are right. Scam coins are everywhere so, identifying which is good and which is not is a great challenge. Investors must be vigilant and wise which coin is good to inves.  For me, I prefer coins with price less than a dollar.  I also check the total number of coin supply in the market qnd the circulating number of supply.  Then, it is advisable to check the price chart to trace the price movement in the market. I also check how many trading platforms the chosen coin tradeable. Then, decide according to the result of your observation if the coin is good or not.