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Bittorrent has the most content.

Agreed. Outside of the US a lot of content is just not available at all.

Even in the US.

I haven't looked in a long time, but it has high quality 4k rips with Atmos sound tracks like a Blu-ray would?

there are entire communities dedicated to hd rips. so yes.

keep in mind, they won't be small.

Private trackers have Blu Ray 4K remuxes before the disks hit the shelves.