[takluyver]

I assume there's some difference in e.g. speed or reliability between Fastly (8 c/GB) and CDN77 (1.6 c/GB)? Even if you can negotiate it to 0.8 c/GB, you're still talking about a huge piece of the PSF's budget. They would have to either cut other expenditure (e.g. making grants) dramatically, or find a lot of new income (continuously, not just a one-off donation drive). And PyPI's bandwidth is growing rapidly [1].

If PyPI didn't have sponsor providing bandwidth, I'd guess it would implement some form of rate limiting and encourage people to mirror/cache packages much more to reduce load. I don't think it would die completely, but it would be less convenient and still cost the PSF a fair bit of money.

[1] https://twitter.com/di_codes/status/1235707819955032069