I don't think people are hoping they split, just pointing out it's a possibility.
I feel that when people thrust their relationship at you by videoing it all and playing it to the world via netflix, it's appropriate for people to comment.
I wouldn't advertise my relationship on Netflix, or post videos to the world of my husband and I doing yoga together (not that we ever would.do yoga together!!) I also wouldn't air my family's laundry for the world to see. If I did, I'd expect people to comment on what they'd seen, to speculate and to discuss.
If you don't want it talked about. If you don't want people to speculate. Then keep private and turn the cameras off.