This is the basic concept behind the success of popular crypto coins, people can easily trust bitcoin but if they wants to invest in old coins then they will hesitate to put money or not. People saw the success of bitcoin so now they can trust it blindly but it does not make a sense that without knowing about it you will be a successful person.
Most of the new projects are just for money nothing else so it cannot give you profit but longer term investment in Bitcoin can make you proud for your decision. Reading about project manager can be a helpful source to decide what to do and also remember that if project manager is unknown and also the coin is new to you then instead of putting your money into risk give a check to the token and then choose to buy or not.
Bitcoin has trust and its growth has also helped the birth of many new altcoins. Not all altcoins are bad, some may simply not be able to compete even when they are traded on exchanges and then they disappear. there are even many more of them that are not listed on the exchange, only made for distribution but not traded.
but you also have to look at some of the potential altcoins that are currently surviving in the market. they maintain their projects and they build a larger market community. If you want to invest, avoid new projects, even though some new projects have also succeeded in surprising the market. but not everything will be as good as the momentum.