I think it’s even worse than that. It’s just a gym sock with a slit cut down the middle to form the straps.

You could make one of these for like a dollar. And some spare time. Probably even cheaper if you already have an old gym sock laying around.

According to a random Reddit comment it was down for maintenance, but that comment was made 20+ days ago. Odd there is no mention of it being down on the main page or anything especially because all of the links on the main page point to forum posts.