What you are talking about is known as Quantum Suicide/Quantum Immortality. And yes, MWI is not just an interpretation, it’s a testable model, though the tests are either unfeasible or drastic. Whether the tests have been accidentally performed during the Cold War, or even that MWI is the resolution of the Fermi paradox (one civilization per timeline survives), is quite speculative.
What you are talking about is known as Quantum Suicide/Quantum Immortality. And yes, MWI is not just an interpretation, it’s a testable model, though the tests are either unfeasible or drastic. Whether the tests have been accidentally performed during the Cold War, or even that MWI is the resolution of the Fermi paradox (one civilization per timeline survives), is quite speculative.