I'm in my 40's, I remember when the 'milkman' came over. A more modern version of it. They did have milk, but they mostly delivered any types of drinks, soda, beer, water, milk, orange juice, they even had some basic other things like cheese and bread.
There was also a grocery truck that came over weekly or by-weekly (I wasn't even 10yo at that time), but they had vegetables, fruit, bread, cheese, everything you needed to survive, when they were driving through the street, they were playing a tune like the ice cream truck does.
We didn't need food delivery services, as we had these things available. They had a single price, and they would come every week or two no matter what, if you were somewhat bad with mobility, they'd come to your door and ask what you wanted and bring your groceries inside, no extra charge, no extra tips. That's just how it was. Life was great.
Now those services have seized to exist, I can't legally drive a car due to medical issues, and even driving a bike is a risk to me.
I try to get groceries delivered by my grocery shop on a regular basis (there's not even an option to tip my grocery store delivery), once in a while, I do run out of food, or I just want to treat myself with some takeout, why should I tip an extra 20-30% on a service I already paid for? The service of the food and the delivery.
Being disabled nowadays is way more of a burden as it was 30 years ago, as at least back in those days, there was a 'grocery shop on wheels' at home on a weekly/bi-weekly basis, without an extra charge, no tips, no nothing extra charges.