>> BOOK8088: And the foreign trade company words will not even consider these details. A similar thing happens with naming products. For example, we gave it a name, called BOOK8088 . If the name is registered as a trademark, we can only change the name. There are many professional complainers who make money from this. Of course, I knew there was a big problem with violating the GPL at very beginning, and I was preparing for something later. I didn't even expect it to develop so fast.

> Which I understand as "you only have to share source code with buyers" (but they can do what they will with it).

You need a proper attribution. This comment goes at lengths explaining it [0] but removing the copyright and/or authorship (attribution in a general sense) is breaking the license attribution requirements.

[0] https://opensource.stackexchange.com/questions/4577/does-gpl...