In almost every industry this is the case. Perhaps with the exception of some government contractors. Even with projects that went to extreme cost to maintain

In almost every industry this is the case. Perhaps with the exception of some government contractors. Even with projects that went to extreme cost to maintain secrecy ultimately failed to do so, IE the Manhattan project. Most tech companies (and non-tech companies) take a fairly pragmatic approach. Generally trust your employees but configure systems with an audit trail so you can hold them accountable later for malicious actions. If accidental, there's not much you can do anyway so just buy insurance.