Think of The Pirate Bay, but you have to get an invite to make an account to be able to leech/seed.

It’s a private torrent tracker with strict rules (you must seed every show you download for at least 24 hours, and every season pack for 5 days, both within 2 weeks). If you break that rule you get a mark on your account, and after enough of them you get banned. As a result of these rules just about every torrent has download speeds above 500 Mbps, and almost every TV show you can imagine is on there.

It’s almost impossible to get into without knowing someone who’s already in.