if there were an ICO for bitcoin then it wouldn't have been called bitcoin anymore, instead it would have been called a shitcoin and i only buy shitcoins for trading purposes to make profit on the bitcoins that i already have.

unlike altcoins bitcoin was not created to make the creator of it rich. Satoshi never made bitcoin to earn money. he made bitcoin to make a decentralized currency. and such creation does not need an ICO or any other shenanigans to raise free money out of thin air.