Large investors, besides investing a large amount of money in bitcoin, will generate altcoins. I will try to explain a simple scheme.
Selected coins where there is a good influence. Buy them large amounts at the bottom. And starting to pursue interest with this coin, it will periodically increase prices, purchases and sales artificially. At a time when other participants appear on the market except you, it becomes more interesting. Gradually, you can reduce and increase sales and purchases. In other words, this is called Pump. In the end, the coin can collapse to a worse base. At the same time, the same investor will raise money from all markets, which participate in this artificial transaction for millions.