BTC and ETH both undoubtedly safe to invest at any time but why peoples investment on other new projects because they need early profit which is not happen in BTC or ETH. New project is always risk because i have seen 90% is scam at end of the day right now.
Do you think people can't get early profits (fast profits) from BTC or ETH? People can trade BTC or ETH, they can get faster profits by trading them. The real reason why people invest in new projects (new coins), it is because they offer bigger profits. New coins are very volatile, they can increase very significantly. But they also can dro very significantly, too. Even, the price can be zero if they turned to be a scam. People choose BTC or ETH because these coins are trusted, while new coins have high risks.