That's only true if you have no way to be put in (financial) risk by the vulnerability you're not disclosing to Apple.
Zerodium - http://zerodium.com/ Azimuth Security - https://www.azimuthsecurity.com/ NSO Group - https://www.nsogroup.com/ ZDI - https://www.zerodayinitiative.com/ SSD - https://ssd-disclosure.com/