I think not 90, but 40%. 90% is a very much. I know a lot of ICO that did what they said.
90% is an ideal percentage there's a lot of ICOs that are scam today. And if you think that it's only 40% you can take a look and analyze on how many of them are dead and scams.
What are those projects that followed what they've said, good for you but not for others.