Yes, that is how it works. Lockheed Martin isn’t a governmental body within the United States and is not bound by our Constitution in any way.
Regardless of our opinions on the matter, those are both private companies with their own rights that are not bound like a government under our current laws. People forget that because “corporations are people” they also get Constitutional protections. Our rights end where their rights start and vice versa.
This is the expected behavior on Reddit when you delete your account. None of your posts go anywhere. You have to manually, before you delete your account, edit them to remove their contents. Requests for deletion under GDPR may function differently.
There isn’t a native mobile app, but this website is what’s known as a “progressive web application”. This means that you can just add it directly to your home screen and it will act app-like. See this thread for exact iOS instructions. Android is similar but does depend on which browser you’re using.
There’s nothing wrong with OCI Images. If you’re concerned about the security of Docker (which, imo, you should be) there are other container runtimes that don’t have its security tradeoffs (e.g. podman).