That would be a pretty broad assumption of liability: I'm not very involved in Ruby but I am involved in Python packaging, and to my knowledge there's been no similar discussion around the PSF's keys-to-the-code control over PyPI (which is in a similar position in terms of supply chain attack vectors).

In other words: that argument is interesting, but it feels strained to me :-) -- I don't think RubyGems or Ruby Central is actually legally liable in this way (or if they are, it suggests a failure of clarity in their EULA/TOS).

Well.. "legal liability" is kind of complex topic. Usually what really matters isn't "what the courts will actually determine if such a case is brought" it's "how much will it cost to prove that lack of liability, and what is the risk that we are wrong?". I also don't believe that such an organization is liable for anything beyond negligence, but whether the lack of an action constitutes negligence is .. well, one can rarely be totally confident in the outcome of that kind of proceeding.

The (mostly PR) explanation they produced seems to express roughly the same thing I was guessing though: https://rubycentral.org/news/strengthening-the-stewardship-o...