How long is the drive he’d have to do every day? If it’s over an hour each way then he will be at an academic disadvantage by not staying local to the university. Its not uncommon for university student class, study group, activities clubs and etc schedules to be very disjointed...and even ad hoc on unpredictable basis. Some activities clubs are often very good at providing relevant experience that increases chances of employment at end of degree course, ie Archaeology club that volunteers on local digs, or STEM club that beta tests software for companies, or a robotics club that competes in national and international robotics competitions, etc. Others are sports and social related.
If he’s in a reasonable commuting distance, then staying living at home and commuting in is a valid option especially if the accommodation is grim and expensive. He’d be in less debt if he didn’t need a maintenance loan, and at many universities the accommodation costs can be almost as high as a year of tuition!
But as he is an adult, I agree with pp that it’s his decision one way or the other. You can offer to him the option to live at home, save money/reduce debt and commute in, and you can say what you would do if you were him, but it is ultimately his decision not yours to make.
You of course, are under no obligation to finance his choices if youre paying for his university. You can say you’ll pay tuition, but not accommodation and it’s up to him to get a maintenance loan and a PT job to fund living at University instead of staying at home.