You were right and I was wrong.
#Wikipedia works because it has a central set of sources that it accepts. One can only add a fact if there is a source that is real, cite-able, and reliable. Moreover, what Wikipedia promises is not "X is true", but rather "Z says X is true". This must be verifiable and Z must be a reliable source.
So Wikipedia does have a restriction process like peer-review (although it is different).
See the excellent (as always) discussion by @pluralistic: https://pluralistic.net/2025/09/05/be-the-first-person/
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