Why GitHub Package Registry Requires Credentials for Installing Open Gems

[projkov]

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I have a question regarding the authentication for installing the gem published in the GitHub Package Registry. The repository is open, and the gem package is open. But users still need to provide credentials. I know that this behavior according to the documentation. But I think it's not okay.

Question: What is the reason to ask credentials of users to install an open gem with open source code? Thanks!