It's really good for distributing huge datasets, stuff that can take multiple days to download. It's also very good for using maximum available bandwidth efficiently, and have downloaders contribute bandwidth.

Linux isos are frequently pointed out as a use-case. I've seen it used for distributing neural network weights recently (stable diffusion and others). Rainbow tables and password lists too: https://freerainbowtables.com/

I have used it to efficiently distribute big files (disk images) over hundreds of computers in LANs. Computers on local switches can exchange data with each other, and computers can come and go on the network.