For those willing to pay for an indexer (e.g., NZBGeek) and a provider (Eweka/Newshosting), Usenet is the pinnacle of "free better." Retention is massive. You can find 3D Blu-ray ISOs from 2012 that are still downloadable at 50MB/s. Use an indexer's 3D category and grab "SBS" tagged NZBs.
(Free, legal, short)
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