I found this new Kurtzgesagt on Quantum Immortality mindbending.

Spoilers for The Prestige!

The many worlds interpretation is what happens in The Prestige.

He is always the one that survives, because of course he is.

To tell if the experiment succeeded you need to be the one perceiving it.

The one perceiving it is the one with the continuity.

That doesn't mean the others didn't die!