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Because people who listen to music generally don't care whether the person singing the song wrote it themselves. You'd be surprised how many classic rock songs were written by someone other than the person who played it.

There are people who are skilled at performing music, but couldn't write it to save their lives. There are also people who are good at writing it, but couldn't perform it if they had to. The people who are equally proficient at both writing and performing are much more rare than you think.

Look at a symphony orchestra. It might have some musicians in it who are amazing at playing their instruments. But they probably couldn't compose a piece of music like Bach or Beethoven did. Is an orchestra "fake" because the people playing the music didn't write it?

And you can't say "but that's different", because it is the exact same thing: The people performing the music did not write it. Many of the legendary musicians of the past played songs they did not write. Elvis Presley did not write the vast majority of what he sang, and he's a legend. It was much more common back then for a songwriter and performer to team up and have parallel careers.

You talk about fake pop bands who don't write their own music. News flash: This is not a new phenomenon. It's been happening since the 1920's when big band music and jazz started to gain popularity.