I'm not sure about the altcoins, in recent days people who believed in growth have lost up to 20% of their investments (in the event that they fixed a loss). This is a very volatile market and you can not be sure of the income.
The people who have lost their investment because of trading alternative coins, they can not make prediction of the price even they have made wrong prediction the professional traders always do stop lost, we must have trading plan before entry and exit the market and always follow the trend of cryptocurrencies price, don't blame the markets because the markets is always right, we just need follow it and we will get active income from the fluctuation of the price.
Yes it is, but because of the great volatility, the stop loss can work in both directions in one hour. This is an unpleasant feature of the market and therefore I think it is necessary to trade manually.