With these new jokers (hey, i am hired at ncwest, my job is deleting forum threads. i never played L2) I will report these posts and maybe it will help in faster killing of this game.
I think by unlegit videos you mean videos of bots/hacks/cheats and that kind of thing? If so, then please don't post them on the forums. It's not the proper way to report them and really only further spreads what those programs are/do. The other reason is that my powers only extend to the forum and I'm not able to seek out and investigate that type of thing in game.
If you do see videos of that kind here, please report them using the flag on the post so that they can be removed. If you see it in game, be sure to submit a ticket so that it can be investigated. Thanks!