Many altcoins are profitable at the beginning, but over time they end up being scams, and most of the altcoins in the market end in failure. To avoid losing a lot of money and risk, investing in Bitcoin can be more profitable than investing in altcoins.
It needs to be pointed out that the majority of altcoins that scam their investors do not become scams, they were scams from the beginning, the people that were behind them never had any intention of actually developing a coin which could become successful.
The whole idea was to enrich themselves and try to maintain the charade for as long as possible just to make even more money while they can, and unfortunately despite the scam being so obvious there are still many newbies that fall for it and lose their money.