Modification and distribution of modified copyrighted content, if not permitted, can be a copyright violation
Generally you are not distributing any content from the game. Most mods to games are using API calls to a mod loader to change the game for the user on runtime. These distributed mods generally have no copyright content in them.
Pyongyang Says It Will Send Support Troops to Ukraine Within a Month (www.kyivpost.com)
In a recent Capcom R and D presentation, Capcom has clarified that it Capcom considers mods equal to cheating, and is worried that "mods that violate public order or morals" will cause them PR damage (twitter.com)
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