buy a typewriter then. There are ways to determine from the sound of it what you are typing. Don't use computers
Everything has security flaws, we just don't know it yet. Open Source is still the right approach to minimizing those.
If you refer to xz that wasn't in there for years. The guy who put it in went the "correct way" of becoming a member of the community before placing the flaw piece by piece. Thats the common / correct approach for a (gov funded) hacker.
VPS = Virtual Private Server, VPN = Virtual Private Network. You can install a VPN server on a VPS.
why IPv6?