Re: bit hypocritical?
Exactly!
The perception problem about copyright is largely skewed by the big players in movie, TV, music, picture, and print publishing industries. (not an all-inclusive list) Those entities have pushed the narrative that violation of copyright is stealing of revenue and is akin to taking food from the mouths of babes and even calling the act piracy. Therefore punishment should be steep fines and/or jailtime.
This leads to thinking copyright=proprietary=profits and the opposite of copyright is "public domain"=free. The second part of that is correct "public domain" is free (both gratis and libre) and the opposite of copyright. But copyright is not equal to proprietary or profits. Proprietary/profits just happens to be the most visible use case of copyright.
So many equate "open source" (in any of its' various forms) with "not profit" therefore free (mainly thinking gratis), therefore opposite of copyright, and therefore public domain. All of which it is not by default.
Copyright is a right granted to a creator (i.e author) of qualifying content (i.e. book) to have control of copies of their creation with some limitations such as "fair use". They can demand payment, donations to charity, being kind to strangers, most anything legal for specific uses of copies of their creation. Copyright has value and not just monetary, it has legal force.
The various "open source" licenses would be legally useless without the legal force of Copyright. The creation of Copyright creates the opposition "public domain". Since "open source" relies on copyright it cannot be "public domain".
"Open source" can be free (either gratis or libre or both) or not. Some argue that "source available" software you have to pay for and cannot give away is a form of "open source" and by pure English definition of "open" and "source" they may be right.
Hypocritical? in the sense of using "open source" software to create content under the proprietary/profit copyright use case, ah, okay. As pointed out these users of "open source" just may not have the copyright mindset (profits!) to follow the particular "open source" license restrictions. So demanding stiff penalties for violation of their copyright, but poo-pooing and attempt to enforce a hypothetical violation of an "open source" copyright because it is free (gratis).