It's obvious to the drivers that if they don't take trips, then they don't make money. Clearly then, they've decided that below a certain dollar amount, it make more sense to them to play computer games than take a fare. How they arrived at that conclusion, I don't know. But I have faith that it made sense to them.
I do very small software projects for people I find online. I have a minimum fee. If I take on projects below that minimum, I'd have more work, but I have determined that it's in my best interest to hold out for that minimum rate. If this means that I don't make money on that side gig a particular day or week, so be it. I have my reasons for doing that and they won't necessarily make sense to anyone looking in from the outside.