I also experienced it. but before they introduce investments with pyramid systems. I've learned some about bitcoin. as you say. bitcoin is not a scam. but many people use bitcoin to scam others. and until now there are many things that. we must very carefully choose the investment. it is best to buy bitcoin and keep it for the long term. so you don't follow the pyramid investment .. once again. don't be interested in investments that give a profit of 30% -100% every month. unless you trade on your own. therefore all SCAM investment.