One point that is important to recall is that a market cap is only a suggested valorization of the whole assets of a crypto-currency at a given time.
That doesn't mean that the sum of the values detained by all the holders of that crypto-currency equals that market cap.
Very important to remember because if people would actually want to sell at current market cap, price would fall down quickly and selling price would be far far less so far far less market cap.
Only indicator number, nothing more.