Obviously I can't say 100%, but that site is a very well used site and I've also used it myself many times, and I've never heard of people having problems with it.
Btw, the encodings done on their site and most of the time the files already there waiting to be downloaded from someone else previously downloading it.
Pretty sure that YouTube don't like the site but I don't think they're doing anything bad enough for YouTube to be able to do anything about it, the sites been around for at least 5 years id say.