In Japan, the troubles is occurring that when a person participates in Nintendo Creators Program* and uploads a game playing video to YouTube, a company who argues to be copyright holder claims that the video infringes its own copyright.
The company has nothing to do with Nintendo, but if the person uploading the video does not claim that fact to YouTube, the company can get a part of the advertisement revenue.
At the moment there is no fundamental solution to this problem.
Therefore, People who want to participate in this program should be aware of this problem.
*Nintendo Creators Program is a service through which Nintendo gives you part of the advertising proceeds it receives from YouTube for your Nintendo-related YouTube videos.