Do you sit there like a robot and do nothing more than drive? No music, no radio, no podcasts, no phone calls; nothing?
For those of us who enjoy some form of entertainment while driving, sometimes those things mentioned don't hit right or you getting bored of them or you run out of episodes, especially on long drives. Talking with ChatGPT's just another form of (audio) entertainment. I can ask it about whatever and have it interactively teach me about eg double entry accounting. I can interrupt with the dumbest questions and never feel judged.
¯\_(ツ)_/¯