I think it makes more sense to verify individual releases. There are tools in that space like crev [1], vouch [2], and cargo-vet [3] that facilitate this, allowing you to trust your colleagues or specific people rather than the package authors. This seems like a much more viable solution to scale trust.
[1]: https://github.com/crev-dev/crev [2]: https://github.com/vouch-dev/vouch [3]: https://github.com/mozilla/cargo-vet
Package Dependency land is a crazy place
the same argument can be applied to, "when you park on the street in manhattan, close your windows and lock your doors". Well that won't save your car from being compromised. But it will certainly make it way less likely that someone will steal something out of your car.
Blue check would gatekeep a lot of noble, new developers.
but IMO they'd never charge for such a thing, that's not at all in the spirit of OSS / python dev.