My favorite part about using those is how well it allows me to get a deep stretch. The one my gym has is cheaply made and I rarely use it.
I've watched a few response videos in the past, but I just didn't care. I enjoy watching Jeff and I learn a lot from him, so I don't need to find a reason to stop. Most are just clinging on to him for views like you said.
I really don't buy supplements at all and I usually don't follow these content creators' meal advice either. I'll continue to watch him and learn new things to try in the gym. He's lucky to have such a nice gym all to himself.