Is Optimism chain safe?

Is the Optimism chain really safe? I've been hearing a lot about its potential, but I'm also cautious about investing in a new and potentially volatile technology. What kind of security measures does it have in place to protect users' funds and transactions? Are there any known vulnerabilities or hacks that have occurred on the chain? How does it compare to other established blockchains in terms of safety and reliability? I'd like to understand more about its security architecture before making any decisions.