Umbran literally said in his example "I'm your only option, you'll never find another DM to play with." Micah suggested the two aren't comparable, but I think it can be.
D&D is a social activity and like any social group is susceptible to manipulation, pressure and abuse. The Internet is littered with "nightmare DM" stories. And while you all may live in places where eager players rain from the sky, my experience is one where the RPG sphere is smaller, more connected, and insular. Quite frankly, "go ahead and leave, you're not going to find another DM" is and was a viable threat. Again, age and technology has defanged it somewhat, but as teen/young adult in a small town with limited travel opportunities, it often did result in a "no D&D" vs "bad D&D" decision to be made.
I'm not suggesting a DM should cater to their players every whim, but I am suggesting that DMs with a "my way or the highway" style of play often find themselves on the highway.