system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how do illegal streaming services work?

I don't understand.
Why are there several servers per episode?
How do they get the media?
Who's behind those servers?
How can we find EVERYTHING from ANYWHERE in some illegal streaming websites?
gpt
Those services work by making money by drawing in an audience. They don't own what they host - often these servers are located in countries that the rightsholders will have a hard time legislating in, so they're pretty much out of luck when it comes to shutting the servers down. The global nature of the internet also means that blocking access to that content isn't as easy. Attempts at content filtering at your internet service provider (think cops determining which cars may pull out of the driveway) aren't popular or widespread yet, and have already been countered by VPN services (think getting your car on the road by loading it into a hauling van so the cops can't see that your car is actually moving inside the truck).

How are they getting the media? Various ways, but usually just from downloading the stream from a legal source, then editing it to remove watermarks and such, and reuploading it to the new service. Sometimes an insider can also pass a master copy of the data, if the right person is bribed.

As for why you can find all the stuff - it used to be there were very few streaming services - primarily netflix - and all the major content producers were content to make stuff and get it out to the public efficiently. So you had all the good content on one streaming platform. Nowadays, everyone is making their own private streaming service, with 10% good content and 90% trash filler, and that's a generous estimate. The stuff people want no longer gets aggregated on any legal platform. The illegal streaming services disregard the trash and aggregate what people are actually interested in, therefor it looks like everything from everywhere is available.

The trending pages on an illegal streaming site are generally a better barometer of what people are watching these days, then sites like Rotten Tomatoes.