Personally it would make the choice to say no to the entire thing a whole lot easier if they self-reported on themselves automatically and with no recourse to hide the fact that they've used LLMs. I want to see it for dependencies (I already avoid them, and would especially do so with ones heavily developed via LLMs), products I'd like to use, PRs submitted to my projects, and so on, so I can choose to avoid them.

Mostly this is because, all things considered, I really do not need to interact with any of that, so I'm doing it by choice. Since it's entirely voluntary I have absolutely no incentive to interact with things no one bothered to spend real time and effort on.

Accountability. Same reason I want to read human written content rather than obvious AI: both can be equally shit, but at least with humans there's a high probability of the aspirational quality of wanting to be considered "good"

With AI I have no way of telling if it was from a one line prompt or hundreds. I have to assume it was one line by default if there's no human sticking their neck out for it.

LLMs can make mistakes in different ways than humans tend to. Think "confidently wrong human throwing flags up with their entire approach" vs. "confidently wrong LLM writing convincing-looking code that misunderstands or ignores things under the surface."

Outside of your one personal project, it can also benefit you to understand the current tendencies and limitations of AI agents, either to consider whether they're in a state that'd be useful to use for yourself, or to know if there are any patterns in how they operate (or not, if you're claiming that).

Burying your head in the sand and choosing to be a guinea pig for AI companies by reviewing all of their slop with the same care you'd review human contributions with (instead of cutting them off early when identified as problematic) is your prerogative, but it assumes you're fine being isolated from the industry.