Fuji is invested in the Haruko national high school tournament, so it make sense for them to promote national team after they are high school stars. Fuji also now has invested in a new volleyball anime project "2.43".
I had no idea there was another one. I know Shonen Jump is in theory directed at boys and (mostly? I don't know) features mangas with male protagonists, but come on, someone write and publish the female equivalent to Haikyuu already.