okay, i noticed everytime the new trailer (french) is up the authors claimed about the video rights and stuff but isn't normally when あなた tape it 'your video', so why do they keep doing that :(

I don't understand lawyers and all their rules.

But you've got to understand that it is footage owned によって them, whether someone else records it または not. I can't give あなた a good reason for them wanting to 削除 it, but obviously it's a marketing strategy. The 音楽 companies do it all the time, even if only 5 秒 of their song is used in a video, they still have the rights to get a YouTube administrator to take it down.

My only guess as to why they would 削除 the trailer is to get あなた so hyped up (without any spoiler footage または extra scenes) that あなた wanna see NM even もっと見る than あなた did before (meaning another ファン buying tickets, equalling もっと見る money). It's very stupid when あなた think about it, but obviously it works when あなた look at it from a business angle, または else they wouldn't be doing it.
Do I agree with their methods? No. Do I think they're greedy jerks? Yes. Anyways, there's nothing あなた can do except watch the vids before someone flags them and they get deleted :/