To me, how you define”YOU” is the key to understanding this.
Jay Thakar
1

Hi Jay, thanks for your comment. I definitely agree: if survival means that “you”, as in, the collection of atoms and molecules that makes up your physical being, that’s certainly guaranteed based on the Many Worlds picture.

One thing to note in this context though is that proponents of quantum suicide tend to argue not only that you’re survive in that sense, but also that you will never subjectively experience death. That claim is, of course quite a bit more controversial.