How do you all have so many cars and tracks

I’m very new to ac and I have read around in the reddit. And I see people saying having 5k cars 10k cars 1k cars. And I’m just wondering how? Did you all actually download them all one by one? Because it takes like a minute to download a car of assetto world. So 1000 cars is a 1000 minutes. Sorry if it’s a dumb question but like I said I’m very new so i was just wondering. And btw is there any other place to get cars except for overtake and assetto world. I don’t mind paying for a good car.

I also wonder do people have like other apps (the python and lua apps) then like the 3 pure apps because i saw a video and this guy had like 20 different apps when he was scrolling trough them. If so what other apps are there? And where can u get them?

Also excuse my English if it’s not the best. It’s not my first language.