The motherboard normally comes with SATA cables so that you can connect hard drives to it so that data can be sent and received. The Hard Drive power cable will come with the power supply.
Like, others have already said the manufacturer's of the products normally provide a bunch of cables. Whether or not you want to buy custom sleeved cables is up to you.
Because a lot of people on the internet expect content creators to produce content that suits them. Unfortunately, it's not possible to do this for everyone. Content creators have to find a way of pleasing as many people as possible as well as deal with the websites they use that are constantly changing ToS. Why it's taken off recently? I don't know.
Personally, I like the content on Netflix. You can try for the first month for free (I think), you could try it out that way and if you don't want to continue with the subscription, you can easily cancel it.