My friend is a trader, he doesn't always win and make profits but I think it's hard to say that he has been scammed in the crypto industry.
However, your opinions are quite true for me. There are too many mistakes I made:
+ I participated in a ponzi project called GoldReward

+ I lost my MEW wallet because I registered through a scam website;
+ I have invested in some poor quality projects such as COMSA, PlayKey, Cappasity, Universa, CyberMiles

However, I continue to stay with the crypto market because I believe that this is a potential market and gives each person a chance to make a profit if they join and take time to learn.
Now blockchain & crypto information is everywhere, I hope the new participants won't make the same mistakes as I did in 2017.