Downloading tons of content. Seems more likely than being a central streaming hub for tons of people for multiple reasons.

So how much traffic do you generate?

40 TiB per month are 1.3 TiB daily. Even at 10 GiB per movie that’s 100 movies every single day. I doubt that is the reason.

What exactly do you want to do and how?

“we” as in absolutely not most people.

For simple PC unlocking etc. they are perfectly fine and improve security due to their far higher usability.

The same way 10 key files on 10 different locations combined with this and that are more secure than a simple 60 character password. But the simple password is far more practical, so far more secure overall since people actually use it.