Seems like a lot of the problems had by the low friction of first eternal september and now LLM genrated reports and contributions, could be resolved by restoring friction. First time reporters/contributers could be required to send their report or PR by paper mail. Strict requirements for the sender: all text printed on postcards (no letter opening) as QR or other data codes according to a standard formatting. Anything even slightly off goes straight to the trash, high signal/interest contributors can still get their foot in the door.

The eternal-september; or its international equivalent, kills things because the nature of the public you are interacting with has changed.

These issues with reports and junk contributions come about because there is a huge payoff for pretending to be part of the community, but the benefit from actually contributing is generally less direct.

I dont think you can solve this with "friction", because the people you want to dissuade are more tolerant to these kinds of barriers than the ones you want invite in.