When someone covers some else’s song

I’m tough on this…but admittedly inconsistent.

My overall position is: Why did you cover it?
But what I’m really asking is for something transformational. (e.g., when The Flying Lizards covered The Beatles Money)

Update Spring 2024: When boygeniuns covered The Killers Read my Mind and there is this YouTube comment on the former

Marquee example: The Whole of the Moon

But, holy shit, Fiona