maybe not all ico ends scam there are some who are successful but most for now are not successful. so I think maybe 70% is a scam and why only 30% are successful because many investors who are afraid to invest in ico will make a lot of ico fail.
Well , I do not think that 70% of scammers for me are much more ico that are not successful especially in this market of the order of 90%, I even now have not heard of successful ico for December or November