Fast food is pretty bad when it's fresh. It's awful after it's been in transit for 20-30 minutes or more. The idea of spending $10 or more to get a lukewarm burger and mushy limp french fries has no appeal to me.
I think people are ordering from more upscale restaurants, not McDonalds.
Food temperature is a personal preference, some people are really picky about food being hot/fresh, some aren't. I prefer the taste of room temperature food over hot food so "sitting around for 20 minutes" would be a feature for me.
He owns a Mercedes so he probably loves driving. Maybe if he wasn't delivering for UberEats he'd be out joyriding in his new Mercedes without a destination. In doing UberEats he's got a destination and he'll decrease his expenses by like $5/hour and take another car off the road. I know a guy who spends like half his free time driving around in a $70,000 pickup truck because he enjoys it, doesn't have a destination, just goes for a drive for fun.
And some people like really like McDonalds and don't care for the fancy stuff.
It's not for me, but it basically it boils down to "people like different things than me."
I know someone else who can't understand why anyone would ever play video games "its time and effort for zero reward."
Some people enjoy doing work on their car, while others would rather pay someone to do the work for them.
Food temperature is a personal preference, some people are really picky about food being hot/fresh, some aren't. I prefer the taste of room temperature food over hot food so "sitting around for 20 minutes" would be a feature for me.