> or receive benefits from any third-party effort for 61 more years.
...do they?
Like let's say I make a modified version of this game. Technically my modification is illegal to distribute since it contains assets I don't own the rights to. However, the creators of the original game don't own the rights to my modifications either.
If you post a video about it on YouTube, they can and will demonetize it and send any revenue to the IP holder
Yes, but this has less to do with copyright law and more to do with Youtube's policies.