It matters because your posts aren’t just entertainment in the moment — they’re your history, your proof of existence online. Platforms treat them as disposable. If Instagram dies or bans you, your years of photos, writing, and connections vanish. Owning your data means your work and identity survive these issues, if you want.
I think a lot of people treat their own content as disposable also though. I don't know if most people would really care to save or dig through their entire Twitter history, for example. The rise of Stories is evidence of this. We're moving from a culture of preserving ancient pieces of paper to swimming in a never-ending river of data where there's so many things coming at you that you just move forward and don't have a ton of time to look back.
People that really want to preserve and archive their content find a way to do it and manage it separately. I have all the pictures that I've posted to Instagram. I have anything I've written that I cared enough to keep. If and when IG dies or I move onto the next thing, am I really going to want to meaningfully preserve and transfer the specific contents of that walled garden somewhere else? Maybe. I can definitely see the value, but it doesn't seem super compelling to me yet.
There is something to be said for the uniquely curated walled gardens and the centralized trust and organization and opinions they bring. When I started an Instagram account, I didn't want to transfer my Facebook world, it's a new world with a fresh start. I didn't want the same friends, the same voice for myself, etc. I certainly wouldn't have wanted to dig through all of that to figure out what made sense to carry over.
An example: I have been a Swarm user for like, fifteen years. As soon as atproto has private records, I'll want to set up syncing that data into my PDS. It's kept track of a huge part of my life, and losing that would be sad.
You asked me to explain why this matters. I did. I think your answer is fairly dismissive. Not everyone who cares about this is going to be some terminally online edge case. Unclear why ask a question if you are not curious about it. Probably not an effective use of our time.
I mean.. if you can still find the archives (pretty sure they're out there, but getting harder and harder to find), I have my name on lots of usenet posts from the 90s. But I'm pretty sure all my BBS posts, GEnie posts, etc from before that are gone - they would stretch back as far as December '84, IIRC. And there's probably very little left from before 2000.
And yet, I don't lament that 10-15 years of my online life have "vanished" - I was an ignorant little snot back then, and actually, am VERY glad they HAVE vanished. And thankfully I've generally used aliases / usernames instead of my actual name in most places (other than the usenet posts that were from my university account) so that wayback can't be used against me easily. Heck - I wish I could assert/enforce a "right to be forgotten" (vanish) on some websites. Rarely have I wished (especially in this current administration) that I was MORE visible / persistent online.
