Is it because crypto is worldwide? Exploits are too many. It is almost everyday that we are reading about crypto exploits. Among them DeFi and Bridges are very common more than other ones but which are also common.
Exploit has risen with how AI has evolved, the US AI labs are putting guardrail behind the LLM model so any cybersecurity research related activity requires KYC or the company approval, the open source model didn't and there are abliterated version of the open source model that removes whatever guardrail built into the model.
Not saying open source model is bad, but Defis and bridges need to invest more into bug bounty and security, otherwise they will keep facing the same problem over and over again.