Again, CDPR is not trying to stop mods, and not even trying to stop modders from making money from it, as long as users offer to do so voluntarily to help with the effort. The sole thing they complained about is the modder FORCING users to pay, because this turns the mod into a commercial service, which was always prohibited by their EULA.
A lot of software has limitations for commercial use. For example you weren't allowed to use a Quest in a business setting for years, and after the introduction of their recently killed business program you were only allowed to do so if you bought the technical identical business version at twice the price, with the sole difference being the license. Not sure if it is still in there, but in the past the Windows EULA explicitly prohibited using it to run a nuclear power plant, most likely to never get drawn into the astronomical regress demands in case of a nuclear accident.
Companies can absolutely define under which circumstances their software is used, and that includes what tool you can use with it. And technically Ross's mod requires a copy of CD Project's game to function, without them ever having given permission to sell such an add-on, and legally he cannot simply claim that it is the users breaking CD Projects license agreement.
Running an aim assist tool with your totally legit copy of your game will get you banned, and the company offering that aim assist tool will get a much less friendly DCMA takedown request than Ross got from CD Project, referring to their license that explicitly forbid offering mods as a paid-only service. And they left the door open for him to keep working on the mod and still make money by making it available for free but stating that new updates would only be released if a certain monthly threshold is met on Patreon, because this way it would again be up to the users to decide to support the developer. He decided to drop the project instead.
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