The ratio of light speed to the area of the universe is so stupidly small that I'm convinced our simulation is determining how low the speed of light can get before interstellar travel is outright impossible.
How does the receiving technology get built? Surely at least someone will have to go there the first time, and they will have to take the long way. It will still be quite a problem to get to a system 10k light years away.
So we ship off these receivers to circumvent that limitation. Instead of travelling ourselves, we can send off our consciousness to inhabit a human-life analog to explore.
What that does to your psyche, and your body in limbo, are probably good material for a story, if it hasn't already been written.
At best, you'll throw a bunch of nanoprobes everywhere to get new entropy into the system.
The tricky thing is that hacking is usually an iterative process, and these iterations are going to be an extreme exercise in patience.
Actually, another tricky thing: how do you know that the other end is actually cooperating? If the aliens are dicks they could give you the thumbs up while having zero intention to reconstitute your consciousness. If you wanted to round-trip some brave soul as a means of verifying everything works, they could just send one of their own minds back instead, just for the fun of wreaking havoc.
No kidding! On the first try you accidentally end up causing a revolution because the targets/specimens ended up learning about the scientific method, gunpowder, and other dangerous things instead of just getting a proper advanced consciousness installed. So now all you can do is try to shape said species technological progress towards building the correct technology that you can hijack for your own purposes when ready.
"Just be patient"
I presume humans are the result of such a hack a few billion years ago.
Interstellar travel require patience, at least to get beyond the initial latency.
Besides, the serialisation process is a form of quantum measurement. Depending on how coarse-grained it is, there might be no way to take a snapshot without modifying you (maybe the measurement process turns the original brain matter into soup).
Cloning a hard drive can produce the same data, but without any networking, there's no reason for the original machine to know anything from the perspective of the new one
What if there were 100 billion of us in total?
Rip yesterday me.
Sounds like a copy, not a transfer. If you didn't physically transport the atoms, the matter, you would end up with two duplicates living at different places and time, and with different ways of thinking after the copy, as the living experiences will diverge from that moment.
This unless you exterminate the original with each copy. Also should be considered each copy may lose information, degrade (signal integrity through distance, number of travels, and so on).
The problem of synchronization is gonna be particularly nasty in this case.
And most certainly after sleep.
It's like walking into a room and forgetting why you walked in there.
On the other hand, there exists two spots in the universe that are so far separated from each other that they observers in both spots will never be able to see, affect, or pass information between each other, simply because they're too far away and the speed of light is too slow. That's silly.
Time is relative to your frame of reference. If you travel to Proxima Centauri at 99.99% c, it will take you 22 days from your point of reference sitting in the spaceship, which is quite acceptable. On Earth, 4.24 years have passed. So, your family and friends grow old quite fast when you do interstellar travel without them; hence, it's better to take them with you.