Dotcom-style revenue swaps?
"Internet infrastructure companies were simply swapping equipment and putting it on their books as revenue. They essentially handed pieces of paper back and forth and called it money."
https://www.inc.com/niel-robertson/brilliant-failures/dot-co...
I went through holdings of top 5 ICOs on Ethereum. One of things struck me was that many of the ICOs had huge amount of cross holding. So, X was holding a lot of Y and Z coins, while Z was doing the same with other ICOs. The number of inter-connections was astounding.
So my opinion is that something is off with the ethereum ICO system. I know that sounds tinfoil hat wearing conspiracy and I don't have solid proof or graphs. But given the evidence of Ethereum's distribution it looks more likely.