Preventing these secnarios requires both convincing large organizations to implement cryptographic timestamps and implementing these timestamps on every significant private archive. Even the implementation cannot be done on anything close to a five-figure budget; engineering time is way more expensive.
It's also very very hard to convince middle managers who don't understand cryptography to publicly post (hashes of) private data for no conceivable benefit.
Preventing these secnarios requires both convincing large organizations to implement cryptographic timestamps and implementing these timestamps on every significant private archive. Even the implementation cannot be done on anything close to a five-figure budget; engineering time is way more expensive.
It's also very very hard to convince middle managers who don't understand cryptography to publicly post (hashes of) private data for no conceivable benefit.