Why are people downvoting this? It's just practical. If you don't reduce the amount of storage you use, the cost of storing will constantly and steadily rise, will donations or personal budgets keep up? Maybe on lemmy.world or other mega instances but it just won't be the case for everybody. I think purging old content is gonna be a reality eventually, even if it takes a really long time before it catches up to the larger instances. And it's going to be OK as long as, as this person suggested, the rules for purging old stuff is tenable for everybody.

For example, does lemmy.world, lemm.ee, and sh.itjust.works really NEED to keep each other's entire federated post history, in perpetuity? As these guys grow larger wouldn't it make sense to start purging very old duplicate content between them? Stuff that hasn't been accessed on the instance in, say, over a year? Mind you, I believe that before we get to this point, there will be other systems in place. For example, the Reddit archive sites were never run by Reddit, and they often contained ads or other monetization strategies. Donations can keep the most recent or relevant content up on the instances, but somebody somewhere is gonna have to pay for this content to stay out there. For all we know, it's gonna be fucking Google and their seemingly unlimited cache. For all we know, some person at Google is spending his 20% personal project time subscribing a bot to everything on the fediverse and collecting data for some kind of new search engine right this very second on Google's hardware.

Anyway, just some food for thought.