They do it so that the coffee stays warmer longer during the winter months
My personal preference to accomplish maximizing coffee extraction is to use extra filters and less coffee grounds but that takes longer which may not be a viable option for that type of business.
[1] https://www.seriouseats.com/make-better-pourover-coffee-how-...
edit: and maybe im a coffee snob or value my taste buds but id rather stay in bed than drink that stuff