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1. Checking if some torrent exists in principle (by searching for words in a name) 2. Searching for the same files in other torrents (when you click on the file size on some torrent page, it will show all other torrents, which contain files of the same size, it is pretty good method of searching for larger files) 3. Just as an open dataset, which contains a lot of torrent metadata and which you can use in your torrent related projects.

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Also, just to have a torrent indexer, which will be there forever. Other large indexers had almost 40-50 mln torrents, when they were closed, all that information disappeared almost overnight. In my case, the cost of running is very small, the legal threats shouldn't be the problem either (come on, it is really not possible to download anything from there). And even if something happens to me - others can continue where I left, since almost all site data is open, anyone can create a similar site in a month or so.