There are situations where this makes sense.

I gift meals to people in other cities when they're in need (sick, childbirth, death in the family) and I'm not nearby to help.

I've had intense working situations where an extra hour of work was worth paying someone $30 to deliver my $100 of groceries.

We've frequently used DoorDash and other services for small business meetings where we wanted to provide lunch, or in some situations where we had to stay late (security incidents, etc) and wanted to provide the team with something better than pizza delivery.

However it's also scary to watch some people who will DoorDash whenever they feel like it without regard to the cost. I watched some eye-opening conversations among college students comparing how much they had spent on DoorDash in the past year, even though they were not in a financial demographic that should have been indulging in delivery.