Gaming overlays are quite useful for players who need a multitude of features and controls during gameplay such as capturing screenshots, broadcasting, chatting with friends or just keeping an eye on their PC’s vital stats like GPU and RAM usage.
Discord, Steam, Origin and many other services, including Nvidia’s GeForce Experience (exclusive to their own GPUs), already provide in-game overlays, so it is a bit of a crowded market. Microsoft’s latest offering is the refreshed Xbox Game Bar that’s just come out after the Windows May 2019 update.