Rules:
- History of the world before your birth remains the same; only events happing after your birth can be changed.
- The other version of you must still be alive, you cannot go to a world that you are dead in. (This essentially forces you to murder/abduct your alt-self, so travelling has a ethical cost to it 😉)
- There may be other multiverse travellers out there
(Btw, is it ethical to murder an alternate version of your self? Is that even murder or just self-harm technically?)
Why would I have to abduct my alternate? Can’t I just make a living for myself in the the other universe? I’d be going to one that had much more liberal ideas about identity and needing money. I’m old enough that decisions made during my lifetime could* have lead to fairly different state if lefty / anarchist forces had been more successful than oligarchs and right-wing reactionaries.
*I’m assuming the point of multiverses is they don’t need to be highly likely, just logically possible.