Also, given enough money available, why ask people to build vulnerabilities in ? Does anyone seriously think Apple's (or anyone's) kernel team doesn't have a single guy/girl that made at least one mistake ?
And Apple, as well as Microsoft, Intel, and other companies have already voluntarily agreed to give the NSA and other agencies "early notice" of a vulnerability which can be exploited by the time it's fixed anyway. CISA also pretty much mandated it into law as well.