Game Mute Button
I'd like to suggest there being a Mute button next to the Follow button on a game's category page.
Speaking from experience, I've had multiple games spoiled by streamers on my Following page, either through their titles or unfortunately timed preview thumbnails. The latest incidence of this being a game I was only about to purchase today but now cannot, also meaning the developer has lost income because of it.
By putting a Mute button on a game's category page, and a user clicking it, any streamer with that game set as their currently streaming category will be automatically hidden from view sitewide for that user, allowing greater spoiler protection for those who are currently playing that game themselves, or are thinking of purchasing it in future.