[Wikipedia] don't let just anything get posted.

Yeah, but that isn't what I said. They do let anybody edit entries. On those two pages whose URLs you posted, see the little edit buttons? Click on one and edit away. Try going to a subject you know a lot about and check how accurate it is. Wikipedia is rather good, all in all.

Also, print dictionaries and encyclopedias have editorial boards, and those editors have their opinions and pet peeves. Just like newspapers and school textbooks, etc.