I was discussing this earlier, something about a supermarket using deliveroo to deliver food rather than their salaried employees in company vans. Those employees get sick pay and thus obey the law like isolating after a positive test. If you're paid per delivery you aren't going to put health and safety first, you aren't going to park safely and spend 15 minutes doing the delivery, you're going to break as many laws as you can and deliver as much as you can and generally make everything worse for everyone because you have a financial incentive to do so.
It's going to have to change.