Cal doesn't need much to fund football. Plenty of Div 2/3 programs exist, granted many make a payday playing some SEC team. The ACC teams obviously all get a much smaller chunk from that conference than the two big ones, but that doesn't mean they can't survive reasonably well. One thing about NIL is it makes those programs even less competitive for recruiting.
I'm a UNC alum who never attended a football game there in 4 seasons.