> You are saying that by uploading a library that works well, and whose presentation (docs, etc) are high quality ("professional") that the owner now has the responsibility to publicly state whether this is a personal project or not, and they must state their SLA and process with respect to accepting patches?

No, I'm not. I'm saying if you setup an open source project framed as a project that is production ready & open to patches with a guise of being run by an organization and intentions of having a community, then it is reasonable to expect that you actually do that. You don't accidentally make a github organization, after all. There are community norms around what you can expect when working with such projects. Particularly when then both the github page and the webpage speak of being welcome to contributions ( https://github.com/actix/examples#contribute ) and building a community.

This was not just a high-quality library tossed out into the wild that got adoption. This is a library complete with these pages https://actix.rs/community/ & https://actix.rs/code/

The author did a hell of a lot more than just "uploading a library" here. As such, the developer assumes these responsibilities because it's what they said.

You are always responsible for what you broadcast.