And I could follow you a few minutes later and change "is" to "will be", or "isn't". Nobody's really doing rigorous checking of every edit. So unless a moderator happens to spot your (or my) edit and questions it, other people will be relying on the veracity of the last person to hold the eraser and pencil. Wikipedia *can* be a great resource, but it's only as good as the people who try keeping any particular entry on the straight and narrow.
(As an aside: "ChatGPT" has gotten a ton of press in the last few weeks, so I decided to try it the other night. I asked it to generate a few paragraphs on WOR-FM, shich hasn't been around in 50 years, and which I've got a bit of first-hand knowledge of. ChatGPT did an amazing job of quickly kicking out a mini-essay that was (1) literate, (2) on target, and (3) wrong. Lots of factual errors. I feel for any student who tries to slip a ChatGPT generated essay in for a class assignment, unless they've checked the facts really carefully and edited it within an inch of its life. Try it some time with a topic that you're already an expert on and see what results.)