then,
how multiple site listing works? do they distribute partial raised funds to exchange sites?
As far as I know there's an allocated fund for listing to exchange sites as they know that there's always a fee. However, listing in decentralized exchange doesn't require a fee or maybe there's a little and actually even unbeknownst to the team the coin can be listed there without their approval.
Exchanges aren't responsible for holding the total market cap of that coin but it sums up each of them on how much is the volume of that coin per exchange if there's variety where they are listed but if not I guess the developers itself identifies it's total market cap.
Marketcap is indicated by the price of the coin plus then multiply the total share price. Which that means the higher the marketcap many investors had put their trust on that certain coin.