Just to be clear i was referring to fat bikes being ridden on the road. Off rode makes good sense.

Fixed gear bikes i can understand. I just sold mine, but they are known to help pedaling smoothness. However, they require long stretches of flat road not interrupted by traffic stops which i dont have.

I was thinking fat bikes are popular as they provide a good aerobic workout? The chain rings are tiny (32/22) so its like a spinning class but only outside.

If their popularity is due to people seeking attention. That's kind of sad.