let's distinguish what you could haver suffered from:

there is scam

and those that just werent successful,

and then there are those that simply werent able to gather the funds needed,

or worse weren't able to use those funds to hire experts to build what they wanted to build.

i increasingly think that scam is an insignificant fraction of those icos that failed.

we have had more than 23.000 ICOs so far!!

are they all listed on all exchanges and coinindexes how it would have supposed to be?

-> no

regards