There are real problems with the Torrent files for collections. They are automatically created when a collection is first created and uploaded, and so they only include the files of the initial upload. For very large collections (100+ GB) it is common for a creator to add/upload files into a collection in batches, but the torrent file is never regenerated, so download with the torrent results in just a small subset of the entire collection.
https://www.reddit.com/r/torrents/comments/vc0v08/question_a...
The solution is to use one of the several IA downloader script on GitHub, which download content via the collection's file list. I don't like directly downloading since I know that is most cost to IA, but torrents really are an option for some collections.
Turns out, there are a lot of 500BG-2TB collections for ROMs/ISOs for video game consoles through the 7th and 8th generation, available on the IA...