Maybe I'm a little more intelligent than most, but have you even attempted to look at the available settings?
First, click the COG in the top right (settings). Click "more". Read what you have selected there. It's pretty self-explanatory. Are you sending your usage statistics to the team? If so, common sense says, "Fool, your streamed videos would definitely be considered a usage statistic-- including the file names."
Second, do you have "Show content suggestions on TV" selected? If so, that would do that part for you...
Third, why would they ever host illegal content for free for you? Are you paying a recurrent subscription fee for using Videostream? Ohh you aren't? Well, then how in the hell do you think they would be able to afford the licensing fees associated with serving that content or the servers and bandwidth required?
It's quite bewildering how dumb the general population is sometimes. I know, common sense is a bitch when you don't have any. Try and use your brains before posting something as silly as this and saying it's an important question that needs answering. For serious...
Cheers!