Hackers are attracted by large sums. If large sums of money are not circulating on the platform, then most likely hackers will not look for its vulnerabilities and check how secure it is. And in new platforms, it remains for developers to believe that such platforms are safe. Cryptocurrencies are developing and new products are emerging that people are actively using. And if you don't try the platform, you won't know how convenient and safe it is.
I do not know whether this is good or bad, but only time will tell how safe this or that DEX platform is.
Sometimes the platform seems very secure and attracts a lot of users who believe that it is safe and keep their funds on it. Hackers see it, they see a lot of money and hack this platform. The more money there is on the platform, the more attractive it is for hackers. They look for vulnerabilities in the platform and at some point they find them.