Why do people complain when a singer lip syncs or looks like they’re not actually singing?

If you go to concerts mainly for their voices, just stay home and listen to Spotify or something at that point.

I don’t go to concerts but if i did i would go to concerts to see them. The idols/artist Because if i was there just for their voice, i could just stay home and turn on Apple Music!

Like i am there for them! But if you actually care more about their voice than themselves then you have no reason to be at a concert
Why do people complain when a singer lip syncs or looks like they’re not actually singing?
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