There is no ICO in Decred.
ICO is scam, people pay a pre-set amount off the market for a promise written on a piece of paper that has not even begun to be developed and which usually will never be.

The funny thing is that these same people often criticize a premine, where devs need to work to make the market value the coins that will serve as their payoff.
All the similar projects you saw there are copies of Decred.

Decred is a project that finances itself through its own mined coins.

With each block 60% of the coins are destined to the POW miners, 30% to the POS miners confirming the POW mining, avoiding that a concentration of hashrate can determine the path of the coin and 10% are destined to the development fund.
At the beggining, a premine was made to finance the currency until the 10% of mining reached a reasonable amount for that.

Contrary to what the fudders say, the premine doesn't go all for the main devs.
8% of the total coins were premined, of these 8%, half were distributed to thousands of people around the world through airdrop.
Of the remaining 4%, about 1% went to the initial development fund, paying for marketing, design and also other devs still leaving an amount that continues in this fund.

Only around 3% were allocated to main devs as payment for all the work done since 2013, including the development of BITCOIN SUITE, which today is responsible for enabling ATOMIC SWAPS and is a fundamental basis for the development of LIGHTNING NETWORK.
Work recognized and consecrated by other currencies devs and also by LN developers.

Ethereum was coded using the bitcoin suite developed by Decred devs.