That second meme is true.
That clone/machine/duplicate may
think it's you, may think
like you, may have your
personality, and may have your
memories, but
it isn't you.
That film, the Sixth Day? Those clones, especially that of the owner (and the hilarious scene where the deformed clone of the Big Bad looks down on his bleeding-to-death predecessor and calmly rips away his jacket)? They aren't the original person. They're a copy. That's not "immortality", that's
replacement.
It's especially dark when you see that they murdered an injured, young sports star at the beginning of the film and whipped a clone up to take over his life. That guy was dead, and a clone thinking it was him took over his life.
That game Soma? Where you "consciousness transfer"? Yeah,
every time you did that, you essentially took the role of a copy of a copy, and the copy before was left to die. The ending, for example, shows a copy on the satellite thinking that it was the original person all along (when in reality the original person died at the very start), while the copy that uploaded that copy was stuck in the transfer chair, alone, and slowly dying in the dark, realizing what had happened.
Dark, man. Very dark.