I think the one exception there is that you need to distinguish between people who don't take contracts and people who break contracts -- refusing to take a job

I think the one exception there is that you need to distinguish between people who don't take contracts and people who break contracts -- refusing to take a job is one thing, but if a driver frequently accepts a job then cancels it halfway through (eg, they are driving to the pickup and suddenly get offered a better job, on the competing platform), that is a horse of a different color.