There are several "compilations" about. In all the cases of which I am aware, the person selling to stuff does not own the intellectual property contained therein. Just because it was once published in a book or magazine or otherwise, it doesn't mean that it is "free" for public use.
Of course, I, and other writers and contributors on this forum and similar have a personal interest in such matters. At one time I would not have seen anything wrong in buying a set of plans. But once you start to be the creator of intellectual property, and rely on for your livelihood, you take a different view.
When people take something they do not own we call it theft, and IP is no different to anything else that one owns. Car, tools, jewellery, anything.
For some reason, presumably because it is intangible, IP is not valued in the same way as, say, a tool kit, or a car. There are some people, and I'm glad you are not one of them, who would not dream of stealing someone's tools which would help them to do a job, but who would think it fair game to download a PDF that would help them to do a job.
Those of us who have only IP to offer the world find this situation very frustrating!
I don't have an answer to the problem, but if you do, I'm all ears.