There are some instances where there is zero doubt, and you don't even need an AI detector:

my learning base is limited to information until September 2021.

as of my knowledge cutoff in September 2021.

This makes me wonder how many (and with "many" I mean "few") years it will take for this to become a reality:

I wouldn't even mind if it would be an actual AI, that's posting to learn.

An actual AI posting on it's own being self-aware and sharing it's limitations is something I could get behind. But we all know it's this now:

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it's shitposters farming accounts posting things they're not interested in and don't even understand.