According to the article, the Vision Pro will not play common side by side videos. It has its own standard ("WebXR clips"), but nobody distributes these, and videos from that standard are also not playing correctly on the device.

Most likely there won't be any app that plays porn videos because Apple will not allow them. From the article:

> Steve Jobs notoriously believed that the company had a “moral responsibility” to block porn and suggested that “folks who want porn can buy an Android.”

And general movie playing apps might also be required to implement a porn filter. Remember Apple insisted that all Reddit and Tumblr apps have such a filter, otherwise they wouldn't be allowed in the Apps Store, the only way to distribute apps.

If you believe tech battles are decided whether there is access to porn (VHS vs Beta comes to mind), the Apple Vision Pro currently doesn't look like a winner.