From another article talking about this:

For years, Sen. Warner, a former tech entrepreneur, has been raising the alarm about rise of hate-fueled content proliferating online, as well as the threat posed by domestic and foreign bad actors circulating disinformation. Recently, he pressed directly for action from Discord, another video game-based social networking site that is hosting violent predatory groups that coerce minors into self-harm and suicide. He has also called attention to the rise of pro-eating disorder content on AI platforms. A leader in the tech space, Sen. Warner has also lead the charge for broad Section 230 reform to allow social media companies to be held accountable for enabling cyber-stalking, harassment, and discrimination on their platforms.

The linked Section 230 Reform details

He's targeting all kinds of social media, not just gaming platforms.