Ethereum was a popular ICO then, you only need 2.5 bitcoin investment to be a millionaire now.
Ethereum ICO Purchases by size
| Size | Num purchases | ETH |
|---|---|---|
| 20 to 199 ETH | 928 | 60672 |
| 200 to 1999 ETH | 2035 | 1424999 |
| 2000 to 19999 ETH | 2634 | 11652188 |
| 20000 to 199999 ETH | 393 | 17261740 |
| 200000+ ETH | 49 | 16003973 |
https://blog.ethereum.org/2014/08/08/ether-sale-a-statistical-overview/
And how many of them do you think held all this time?
No idea, the ICO coin received has no from/source address record, thus cannot track list of ICO addresses in the blockchain.
That means they have actual privacy. Better than Steemit.
I believe so.