People want to become profitable from cryptocurrency. Some people want secure their fund cause it needs to take higher risk for higher gain that's why btc is good to be hold. Might be give you Small profit but safe. And altcoins are risky. altcoins will give you much profit. A multiple time higher than bitcoin and that's why people jump to altcoin investment but they should keep it in mind that altcoins can trun into shitcoin anytime. So make diversification, buy both btc and good altcoins for best deal
We all know that bitcoin is making wave in the industry and if anyone invest in it he would not regret but this days when SEC started the discussion with Ethereum Spot ETF, the price became stable and when bitcoin was decreasing Ethereum was stable at one point and now that bitcoin is increasing on price, Ethereum is also increasing so for now the price is $3,954 before this will end Ethereum will hit $4k and at the end of the year it will be the predicted price of 6-10k dollar.
Not all the altcoins are risky they way you are saying, those ones that have gained ground like BTC are less risk. Ethereum, Solana but I will not recommend BNB because it is centralized project that for for the " not your key and not not your coins. So if I am recommending it should be decentralized or Open Source project to invest.