Its primary hosts are doing great. And it's got nothing on bacillus subtilis or whatever that cyanobacteria with hundreds of billions per cubic meter of seawater is. And even those haven't 'won' in the sense that sometimes gets discussed around here. They're one form among many. Even bacteria are not the main primary producers in all environments - the land-plants take that up over a third of the earth's surface (in a constantly shifting ecological arrangement with other things).