I'm assuming by pip you mean pypi (the package registry) - I think you're making the mistake of thinking it has a lot more resources than it does, because of how much it punches above its weight.

Pypi is powered by warehouse which has around 3 developers maintaining it[0]. They're doing an awesome job, but the funding and resource available to them are probably substantially less than Astral could have with a paid offering.

[0] https://github.com/pypi/warehouse/graphs/contributors