What Meta is trying to do is create their own version of a immersive social platform where user-generated content and building is the main mechanic and the reason people us it. However, they want it "Disney style" which means it's free of weird furries and NFSW content like VRCHat currently hosts.

Put simply, Horizon Worlds is meant for the boomer audience (think your parents/grandparents) that will eventually use VR, but currently is on the classic 2D Facebook site and app.