Twin Maker: While teleportation doesn’t exist, mindcasting, forking, and reinstantiation, along with more exotic sophotechnology, can create much the same effects. (Although, in mindcasting, the first step is to perform an orderly shutdown, because while you can happily transmit a static mind-state vector, transmitting a running one is a much more complicated procedure that requires special software and is in any case impractical over any distance long enough to invoke light-lag, since it’s kind of hard to think when half your brain is a couple of seconds away from the other half.)
But, by and large, no-one gives a crap, because the generally accepted answer to the philosophical conundra involved, in conformance with the established fact that souls are software objects, is pattern identity theory, and continuity of consciousness does not matter – or as it’s put for the layman, if you think like you, and feel like you, and act like you, and remember being you, then you are you for all legal, practical, philosophical, and other purposes. Yes, even if there are now two of you, at least until you diverge. Get over it, already.