The security of the network depends on the work being widely distributed and having a lot of work to do. If there is a lot of work but one worker is performing

The security of the network depends on the work being widely distributed and having a lot of work to do. If there is a lot of work but one worker is performing over half the work, that worker can compromise the network. If there are a lot of workers but little work, a new worker who is more capable can compromise the network.