Really you can't see why getting stuff delivered to your door is popular, or is this a rhetorical question
The "social question" to explore is about how so many people collectively came to see leaving the house, interacting with others humans, and setting aside work or idle distractions as bad things to be bought off with cash that we had to work to earn.
We know that people like delivery and we know that people don't like the alternatives I mention above, but that wasn't always the case and it's probably worth slowing down to think about what change and whether that might correlate with other concerns.
Suitably cheap labor and the opportunity to hire them has almost never not been available, but industrial-society middle class people who could otherwise afford it long found it to be a luxury to indulge in only occasionally (family pizza night, a cleaning service before the big party, etc) -- not because of unavailability or inaffordability but because class-culture norms acknoweledged it as irresponsible, wasteful, and foolish.
It would be embarrassing largesse to have somebody make a $7 iced coffee and then have somebody else deliver it for another $5. It would be like going to the grocery store in a tuxedo. You might be able to afford it, you might own a tuxedo, but it was just seen as sort of an absurd class theater.
Those norms have changed radically in the last couple decades, and not just on this matter.
And immigrant slave labour has made it all affordable.