Ok, so they're growing some kind of microorganism. But I feel like for years I heard that spirulina would become an important tool for feeding the planet ... bu

Ok, so they're growing some kind of microorganism. But I feel like for years I heard that spirulina would become an important tool for feeding the planet ... but mostly the people that consume it do so in pretty small amounts, and it doesn't seem to be taking over the world. From a skim, the site doesn't actually say what organism they're growing. Why is it more likely to be impactful than others?