I'm not sure about this claim. From personal experience using ADSL, a 3G USB stick, my uni's 100Mbps connection back in the day and lowly 128k ISDN, I'd say that a torrent can either saturate one's connection with a healthy swarm or be slow as molasses due to the lack of seeds. I'm not sure how a seedbox can bypass the inherent mode of operation of the Bittorent protocol.
Simple, seedboxes tend to be close to other seedboxes. They then potentially talk to each other over the same network, or a nearby one they peer with, meaning bits generally have less distance to travel and over bigger pipes. A disproportionately large number of seedboxes are hosted on OVH's network.
The capacity from the seedboxes back to you might not be that great, but it doesn't matter because your home connection is so slow in comparison that it can still easily be saturated.
I'm not sure about this claim. From personal experience using ADSL, a 3G USB stick, my uni's 100Mbps connection back in the day and lowly 128k ISDN, I'd say that a torrent can either saturate one's connection with a healthy swarm or be slow as molasses due to the lack of seeds. I'm not sure how a seedbox can bypass the inherent mode of operation of the Bittorent protocol.