The demographic you are talking about wouldn't go because they don't support jacobs now because he has a loss to GGG so they have to downplay him.
Americans tend to only support fighters once they have made it to the top of the sport. See Wilder for a recent case, Americans used to bash him and they said that guy who lost to Wlads trainer and areolla was the real deal. They only jumped on board with Wilder very recently. There are some good hardcore american fans but their casuals only want to bask in the glory and chant USA, They aren't interested until they can do that.
i agree but something else changed too there used to be boxing gyms in every catholic church it was on prime time tv some schools the boys club that's all gone now