maybe we feel bit lonely
Mukbang (eating broadcast), as an Internet paradigm, is so popular in the live video streaming age. There are no boundaries between production and conception, and some of the network anchors are also audiences to other live streamings. A lot of people who love food create their channel because they find watching other people eating is appealing.
Live streaming platforms, like Twitch, create shows that contain a high level of real-time engagement. I believe it also brings a sense of belonging to the audiences; a large number of followers indicates that be active audiences are more interesting than passively sit and receive information.
Also, in Korea, Japan, and China, we are raised with the idea of collectivism. However, when we started work, the fast modern life pace forces us to live and eat alone, and that brings loneliness. Asian (especially Korean) regard the host as their meal pal or virtual accompany, and they are sharing lunch with them.
Furthermore, I think we can dig deeper in terms of psychology compensating.
(I explained little more in the comments)
Both two big eaters have a YouTube Channel, and they also do live eating streaming regularly.
Bunnell, K. (2004) Craft and digital technology
Mukbang: is loneliness behind the craze for watching other people eating?https://www.theguardian.com/food/shortcuts/2018/nov/05/mukbang-is-loneliness-behind-the-craze-for-watching-other-people-eating
If you have no idea about Mukbang, this post can help Extreme Eating: Are “Mukbangs” Helpful or Hurtful to Those With Eating Disorders?