In fact they are an opportunity to make quick profits and are an opportunity for all people. for example, you have 1 btc and you go to the altcoins section and search on some altcoin that will have some good news able to boost the price in 2X and if you find an altcoin that has good news able to boost the price you buy and sells when you have 2X profit. the altcoins have this advantage, but also have major drawbacks. Bitcoin also has advantages and disadvantages