For those who like the idea but don't want to use someone else's bandwidth for it: the PyPI API is described across several PEPs and documented on-site (https://docs.pypi.org/api/); and a mirroring tool is implemented under PyPA stewardship (https://pypi.org/project/bandersnatch/).

But at the individual project level this definitely isn't new. Aside from the examples cited in https://news.ycombinator.com/item?id=46561197, another fairly obvious example of a compiled binary hosted on PyPI is... uv.