Japanese YouTuber convicted of copyright violation after uploading Let’s Play videos::A 53-year-old Japanese man has been convicted of copyright infringement after uploading gameplay videos of visual novel Steins;Gate: My Darling’s Embrace and videos summarizing Spy × Family and Steins;Gate anime episodes.
IIRC, the reality of gaming YouTube videos and streams is that you do it with permission from the studio. I heard that arrangements for streamers are built into the license for the software since streaming is obviously beneficial for many studios. Even so, some content creators still get written permission from publishers to stream. (Frost on YouTube got permission from HiRez to stream Smite, for example.) if a studio says you can’t stream the game, they have the right to enforce it.