The phrase "are mostly run by" is correct and usable in written English.
It can be used to describe the primary management or operation of an organization or system by a particular group or entity.
Example: "The local community centers are mostly run by volunteers who dedicate their time to help others."
Alternatives: "are primarily managed by" or "are chiefly operated by".
The surveillance flights in Africa, which are mostly run by private contractors, are part of a classified Pentagon program called Creek Sand.
The hardest and most dangerous jobs are now performed by machines that are mostly run by computers, and those computers are watched over by people like Guido.
The fact is that festivals are mostly run by one or two dedicated individuals, who get very little money and they're doing it as a labour of love.
So children's services are mostly run by staff who know a lot about education but less about social work: Sharon Shoesmith, Haringey's director of children's services, was previously its director of education.
Micro-funds are mostly run by former entrepreneurs and are much more hands-on with their portfolio companies.Pioneered by First Round Capital and Floodgate, American micro-funds are growing rapidly and now include firms such as Felicis Ventures, Baseline and Founders Collective.
Before any concerned Beliebers start flinging their bras over the barbed wire fences of one of our many immigrant detention centers that are mostly run by for profit corporations like the Corrections Corporation of America (CCA) and GEO Group , Inc I should stress that it's highly unlikely that Bieber will end up in one of them.
It is mostly run by state governments, with the federal government contributing to the costs.
About 230 other classical schools in the country were mostly run by evangelical Protestants.
"The big companies that are part of health and wellness, they're mostly run by men," Bauza said.
Though the dairy industry is mostly run by machines today, human labor is still necessary, he said.
