The thing about copyright is it's not just about the bucks, in fact that's not how it started but that's what it has become. Copyright is about giving the creator of the work the right to determine how it will be disseminated. When negotiating with a distributor or to sell the rights to a creative work, copyright ownership is the only element the creator can use as a basis of negotiation.
However, this means the creator also has the leeway to place works in the public domain or not enforce copyright. For example, ALL the schematic designs I've published over the years are legally considered as "dedicated to the public." That means that I chose not to pursue patenting or otherwise holding on to the rights. This is why you see my circuits in a bunch of products, many available commercially. None of these companies has a legal, moral, or ethical obligation to compensate me in any way, including giving me credit...although if you want to know who some of the good guys are in this industry, Steinberg and Peavey insisted on paying me to use one of my designs, iZotope asked for permission even though they didn't need it, Line 6 credited me for an effect I designed, and E-H will give me an effect if I want one as compensation. I don't abuse that offer, but I have asked for and received several E-H effects over the years. Several boutique pedal manufacturers also credit my designs even though they don't need to.
I've been told I'm owed tens of thousands of dollars of royalties from record companies who own the rights to music I've done, so I don't have a lot of sympathy for them. I do, however, have sympathy for the
original creators of a work. Ideally, those are the people who copyright should be protecting.