I do not think that 50% of failed ICOs is too much. In any business, percentage of loss-making campaigns is high. If we take the sphere of startups, only one project out of ten survives there. So, it is not so bad in the field of ICO as it is given in media
In February it was reported that 46 % of the ICO from 2017 has been already failed. And additional 113 were classified as semi -failed .
That means that their teams stopped communicating with social media or they have so small community that they have no chance for
success. So in February 59 % of 2017 ICOs were already failed or on the way of failure.