But neither can you discredit anything without evidence. The basis of science is falsifiability. That is, we have to be able to prove it wrong.

Not E2EE though

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I think you explain it pretty well, but one thing to add. Due to the General Relativity and thus spacetime it is actually not directions that all point toward the singularity, but as soon as you cross the event horizon all of your future becomes the Singularity, not as a point in space, but a point in time

https://plato.stanford.edu/entries/spacetime-singularities/lightcone.html

This points at that, you would also need to be able to travel faster than light and that would make you time travel backwards in time

I mean, to be fair that is what the linkes page says, but people are misunderstanding the hypothesis everyone calls many worlds (also what the page says) as Many worlds is just a follow up of the theory not the theory itself.

Like Einsteins Relativity didn’t say in the theory that we would be able to predict Mercury’s orbit, but it comes from it.