I am wondering to what point can the desktop theme imitate another, without being sued for copyright violation or plagiarism. Are there any commonly accepted rules in the jurisprudence of what is and is not allowed?
Let's take for example the Linuxfx distro, which themes are imitating those of Windows 10 or Windows 11: https://www.linuxfx.org/
The graphical interface looks very close from the one of Windows.
Some softwares like Microsoft Edge are available for Linux. So, it is perfectly normal that the exact icon of this browser displays in the interface.
But there are other aspects that surprise me more. When looking at screenshots, the Windows "Start button" icon at the bottom left looks the native one (or very close). Some icons, the inner layout of Windows, texts, colors and even the desktop background look identical or at least very similar.
As a software is a whole, there is work associated with its design, how can a distro like LinuxFx and its Windows themes exist without being sued by Microsoft for plagiarism / copyright infringment?