This is not always true. Yes some new coins might bring large returns but it depends on the project and it's utility. I've seen a lot of new projects since 2017 and not all of them turned out to be successful even leave investors in a total loss. I've earned large profits on newly launched projects before and lost a lot of money as well. There is a much higher risk on a newly launched projects and you should always remember that. Be sure to always do proper research if you want to jump on one of them.