I'd rather treat it as a campaign and setting decision than worry too much about canon.
For my purposes, I've assumed cloning took off first with children, then with clone lines (clone children having clone children), so there'd be a strong bias towards citizenship, at least at first.
Pulling in the other direction slightly, there's evidence from studies of identical twins that career choice and success is partly genetic. There's a famous case of separated twins who both became firefighters, for instance. This could lead to megacorps first recruiting from clone lines, then perhaps simply rolling their own. At first as full employees, but if you stumble across a worker who's both good at and happy in some dirty, dangerous job you might just take a sample, then accelerate the growth, training and hiring process to a point where, while they're all getting paychecks (and spending them at the company store) and theoretically free to quit, they're all company men in a very literal sense.