We can not be 100% sure but doing a thorough research helps us a lot in making good decisions. I was scammed in Zenad Masternode project. In frustration and anger I started a discord server - Crypto Scams. It really took off and it has over 1000 members now. Discussing with fellow investors has helped all of us a lot. We have avoided many scams through spreading awareness. Perhaps we need more such initiative so that all right thinking people could unite.