Does the amount of money raised in an ico determine the success of the project??
Is a necessity to do a fund raiser in order to start up a project??
Did satoshi nakamoto and vitalik also started a fund raised??
First question, the success of the project? not really, but it definitely shows that the ICO is succeeded and many people interested to their idea. Most of the project doing ICO before even the product of the project is released, so if the ICO is succeeded does not always mean that the project will succeed too.
Second question, not really there are many project that not doing ICO for some reasons, some of them are already funded by a big company behind them, or they have got some money from private investor, or they have a boom pre-sale, and they don't need to have ICO.
For the third question, as far as I know Satoshi never do ICO, he just created the Bitcoin blockchain, ask some crypto enthusiast to help him working on the bitcoin blockchain and spreading word through this forum. As for Vitalik's Ethereum, I don't think he did any ICO too, but I don't really know the details about Ethereum.