How about a ratio of post upvotes to avg upvotes per post in a community? At least upvotes somewhat correlate with post quality.

While I agree SD cards are unfeasible, Google Cloud Services offers a Transfer Appliance. MSFT Azure Databox is a mere $350 for a round trip 100Tb NAS freight box. I think that something could have been arranged.

And TiVo already has the tech to skip ads in recorded media. I only point this out to show that it is possible to do context based filtering and skip to timestamps. Smart programmers will find a way, and the war continues.