Typically, in the industry, when a company is found to be in violation of the GPL, they often settle by swapping out the offending code for a proprietary alternative or by complying with the license and providing the necessary source files for the libraries used. In the case of D2R, the "GNU Free" aspect became a talking point for the freedom of information advocates: they argued that if the logic layer relies on GNU tools, the community should have the freedom to inspect it.
While Diablo II: Resurrected is a commercial product owned by Activision Blizzard, there are several legitimate open-source and free community projects that use the original game assets to improve or reimplement the engine. Legitimate Open Source & Free Projects diablo ii resurrected 1677312 eng gnu free
Remember: There is no “GNU free” lunch in remastered AAA gaming. Typically, in the industry, when a company is