Fuck, people can't understand the most basic fact.
People watch chuuba because they want to watch anime girl doing cute things. The majority of chuuba fans are males, and I'm talking >80%. Unless you are blind, it's pretty telling that for most people, they finished their work, tired, and want to escape reality to watch their favourite chuuba, and interact with them. Now introduce male chuuba, and everything is in shambles. The female chuuba all of the sudden ignore chat and most of the time, their fanbase clash and creates a FUCK LOAD of dead air or awkward moments. Then those two ended up in even worse position if they chose NOT to collab at all. So to make it up, they ended up having off collab together, start going on dates, etc. Now the female chuuba has no time to entertain chat and chose to graduate to start building a family.
See the point? Although the latter half part is just me running out of meds.