“Wrong attitude for a professional. It’s not a work of art with your name on it. It’s not a copyrighted piece that you own the rights to. They bought it, they can do what they want with it.”
You’d be wrong about that. Payment does not confer transfer of ownership. Those without knowledge of intellectual property law commonly make that mistake.
If a graphic artist I hired copyrighted their ad/brochure/website and I couldn’t modify it without their permission...
I’d fire them.
You may be correct legally, but out of work.
:)