> What's stopping someone from just vacuuming all the data they can until codebreaking catches up with encryption?
The people who have the time and resources to do this are nation states. And if they're going to spend their resources on IPFS, they're also already doing this for intercepted HTTPS traffic because it would be wild not to. Imagine having the confidence to crack strong encryption and ignoring 99.9999% of web traffic so you could potentially spy on the handful of gigabytes of whatever is ending up on IPFS.
Even if codebreaking catches up to the point where it's tractable to start cracking the encryption on these files, the ability to tractably crack _all_ the files is probably many decades away. You can probably be confident that you'll be long dead. And you can almost certainly be confident that by the time any of the files (or HTTPS traffic, or whatever) get cracked, the statute of limitations has long passed on whatever nefarious thing you are worried might get seen.
Of course privacy from the prying eyes of the NSA (or your favorite codebreaking entity of choice) is obviously important, but it really begs the question: what is their incentive to do this? To get in on the furry porn you're uploading? To see your baby pictures? The kinds of secrets the NSA is looking for need to be worthwhile enough for the NSA to justify spend millions (billions? tens of billions?) of dollars building zettabyte-scale data centers and cracking them years and years after the fact instead of spending that money on something more immediately impactful. Quite frankly, those secrets aren't "someone from HN sharing their files over ipfs"-shaped.