Not all altcoins, but some altcoins that have a low market capacity and increasing demand.
In short, it is the simple rule, of supply, demand, and price. If the currency has a limited supply or is burned and there is even a slight demand for it, the price will move strongly, whether upward. Or down, while it would take billions of dollars to make the same change in Bitcoin.
In short, all cryptocurrencies are a high-risk investment, Bitcoin is safer and more profitable in the long term. Some altcoins are good, but the possibility of achieving losses is high.