But I’ll bet it didn’t say that for long.

Wikipedia includes checks and balances in its “anybody can edit” model. Such as the recent posts list, which many volunteers scan to spot vandalism; automated processes called “bots” which auto-reverse the more obvious cases of vandalism, such as blanked pages; and the page history, that anyone reading a Wikipedia article can use to see what changes have been made over time.

No one doing serious academic research would rely on Wikipedia as their only source, but then, no one doing serious research sould rely on any one source.

Studies have been done comparing Wikipedia’s accuracy against other encyclopedias, including Britannica, and it compares favorably.