"If other people have deliveries, I'm less likely to get sick and die."
Outside of the very worst-hit parts of the world, going shopping while taking precautions does not seem to be capable of raising the transmission rate to unacceptable levels. We're not trying to prevent every and all infection, only to keep the rate of new infections at a sustainable level.
The US seems to have an R0 of right around 1 with lockdowns. Shopping is the major place people continue to intermingle.
If we brought R0<<1, the virus would die off. If R0 > 1, we all get sick eventually.
And aside from that, school and work closures are much more expensive than food delivery. The ROI of not having everyone congregate in stores seems huge in comparison.
I say that because I don't think anyone expects the virus to die off, save for a mutation or herd immunity (via vaccine or otherwise). Lockdowns are not and never were intended to kill the virus. Only to control the spread.
Outside of the very worst-hit parts of the world, going shopping while taking precautions does not seem to be capable of raising the transmission rate to unacceptable levels. We're not trying to prevent every and all infection, only to keep the rate of new infections at a sustainable level.