You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
protoc was reported malicious
OSV:MAL-2024-10107 - Malicious code in protoc (PyPI)

protoc

This package was deleted from PyPI around 2024-09-17. Installing fails with:
$ pip3 install protoc ERROR: Could not find a version that satisfies the requirement protoc (from versions: none) ERROR: No matching distribution found for protoc

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pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-09-16/ \ protoc
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Or, download files manually

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0.0.1
0.0.2