The latest game to announce that it's being delisted from Steam is Transformers: Battlegrounds, which is the victim of a licensing agreement coming to an end. To soften the blow, it's on sale for 90% off until it gets removed at the end of the month.
Transformers: Battlegrounds is basically XCOM for kids who watch the recent crop of Transformers cartoons like Cyberverse, with which it shares voice actors and character designs. That means it has bright and blocky "evergreen" incarnations of classic characters like Bumblebee and Shockwave, as well as more recent additions like Windblade, who is sort of like if a Japanese pirate could turn into a jet.
