Looking at you YouTube, deleting videos and removing any trace of them from my playlists.
Sad that you got to download so much these days or it's just gone because a pixel or a single audio nanosecond will get it flagged and deleted.
Indeed. It's still a good rule of thumb to remember and teach to kids getting used to the internet. Post something on social media that you might regret later, and there's absolutely a chance that it gets downloaded, reuploaded, and circulated without your consent. Which at that point, it's too late to control.
It's useful lesson: think twice before uploading something to make sure you won't regret it later.
People forget about nefarious corporations keeping privately shared stuff indefinitely even if you explicitly tell them not to. Or if they swear it's getting deleted.
Also, another part of the adage that is incorrect is a corollary to Murphy's Law. "If you put something online publicly and you expect it to stay online forever, it's not going to, usually due to corporate bullshit."