There are many altcoins on the market that are considered very reputable and reputable, but there is no 100% guarantee that they are safe and will never turn out to be scams. Altcoin and bitcoin ETFs, I still think bitcoin ETFs are safer.
Well, that's a valid concern but I think their are some good altcoins which won't run away with someone's money. I'm talking about coins like Monero, Lite Coin, Ethereum that have been active on the market for many years and have huge marketcap.
Those coins are some good coins in my eyes but surely everyone has differing opinion about altcoins and some people really can't trust altcoins at any cost. I haven't yet lost my money that I use to buy those altcoins but surely the ones who bought Luna when it was on rise have lost enough money by holding it.
That's why I prefer to hold only those altcoins that have been active on market for long term because those can be somewhat safe than the newer ones.