When you try to submit a post or comment containing the string [slash]etc[slash] passwd, the submit button goes into a loading state and spins indefinitely. The request is blocked by Cloudflare with status code 403. You can’t even search for the forbidden string. You have to check dev tools to find out what went wrong, this error is not handled in the UI at all.

So, if you’ve ever tried to reply to a tech issue and the UI just won’t let you, maybe this is why.