I actually think more people have access than don't...
Even in rural and developing regions, there are grocery stores, just not as fancy. I tried to find numbers, but it was hard to find the right source for that.
Anyone living in an urban area would have access and that is 60% of the global population. Plus, rural areas in the USA, Canada, Europe, Mexico, etc etc have access to one.
Only about 25% of the population are engaged in subsistence farming at this point.
The biggest reasons for me to use the clean architecture are faster testing (most logic is in functional code) and most changes having impact in a small number of files only.