Yes, but this is the same for subyshare/filejoker, though they could potentially give out personal information to authorities if ordered to. For torrents I've seen more sites targeted than users. And this is JAV porn which is a niche of a niche in niche distribution (torrents) so to me it doesn't seem like something to worry about right now. If you're paranoid you could remove any watermarks in the releases and reencode before uploading.
And in reality if they are aware that there's pirated material, rather than targeting some users, spend money and resources to try to get something back, a better plan of action would be to introduce a service style website (like netflix) to turn pirates into paying customers.
When would this happen realistically? I could see this happening if:
1. You start downloading a 5GB file.
2. You leave your computer on for a month not touching it and seeing what's happening in the torrent (going on vacation maybe)
3. You come back and realize that the uploader stopped uploading for some reason (maybe the cat ate the network router) so everyone's stuck at 3GB.
4. Result is, you uploaded the 3GB of what you've got to a bunch of other people and used 25GB upload while only getting 3GB of a 5GB file.
So yes, it's possible, but about as likely as Santa Claus getting stuck in your chimney. You would have to go out of your way to end up with that happening, for example limiting your download speed but not limiting your upload speed. Usually when leeching you will have much less than a 1.000 ratio (especially because most connections have higher download speeds than upload speeds). And if you're concerned about bandwidth you can just limit your upload to 1KB/s or something, you will maybe download slower (because you're not seen as a sharing leecher and not prioritized for sending data too) but you will download the file without uploading much at all. And if it's an old torrent without many leechers sometimes you can't upload at all because you're the only leecher around.
