It's "very simple" that you will also "get absolutely no guarantee of security" unless you personally rewrite every line of code you use in a provable/verifiabl

It's "very simple" that you will also "get absolutely no guarantee of security" unless you personally rewrite every line of code you use in a provable/verifiable language, design and manufacture your own hardware, hide in a cave to avoid all social engineering, and so on. Hopefully you see why your advice is similarly impractical.