It is unlikely that every single project was a scam, many of them probably were but there is a big chance that many were the projects of people that thought they could create something meaningful only to realize later that things are a lot harder and that they did not had the talent, the skill, the money and the time to pull such a project, also the failure rate is going to be even higher since only a year has passed so it is possible we get closer to 95% or even 99%.