Earlier quoted context omitted.
I agree, though it's worth noting that while volunteers can maintain the software and administer the indexes, they also rely on infrastructure provided by big corporations. E.g. the Python Package Index runs on a CDN provided by fastly, which serves hundreds of TB per day. I very much doubt the non-profit Python Software Foundation could afford that bandwidth if it wasn't an in-kind donation.
It's a couple petabytes, Michael. What could it cost, $10? Seriously though, Fastly's donation of their CDN service is generous and eases the burden on the PSF, but if push came to shove they could definitely afford the bandwidth. In 2018 they had a net income of half a million.
There's absolutely no way the PSF could afford PyPI's bandwidth out of pocket. Last I checked our "bill" from Fastly would be close to $1.5M/month.
Also given that PyPI is critical infrastructure for millions of people and software projects, anything cheaper would not really cut it.