Incredible as it may seem, I've actually seen that asserted. Years ago when I was a kid, before we had internet, my family would get a lot of magazines. Whoever picked up the mail, usually whoever came home most recently after it was delivered, would flip through every magazine and tear out all the advertisements and throw them in the trash before putting the magazine on the counter for the family to read. I wonder, was that 'theft'? We also used to change the channel or mute the television/radio whenever advertisements came on. Was that 'theft'?
Usually people who call adblocking theft start squirming when these pre-digital examples of ad avoidance are put to them.
Unless that author, musician, or artist operated in a vacuum, their work is a direct derivative of the work of other authors, musicians, and artists.
Every dollar a musician earns I'd, therefore, a dollar they take out of the hand of the musicians, whose work they based theirs off of.
This is why the public domain exists. You can make derivative works without paying anyone... But your work will fall into the public domain, so that you pass this benefit on to the next generation.
But you don't take money out of their hand, because there is no money to take out to begin with. Or did you mean imaginary money? If you did, well, I could come up with many different ways as to how you are doing the exact same thing to virtually anyone. :P
Anyways, you can't physically remove and deprive an owner of an idea. It doesn't fit the definition of theft at all.
No, it isn't. It is copyright infringement. Theft is something completely different. Different laws apply.