Exactly. In fact, I still regularly get sharepoint "request for access" notifications in my email for some presentation I did a year ago. Even though I swear I've opened it up to the entire org.

Who knows what happens when I've shuffled away from my current company.

Dead links are also incredibly common, particularly because we are on our nth port from sharepoint to confluence to whatever back to sharepoint. Generally, because C levels don't want to pay for this year's price hike.