Every video there has everyone's art uncredited and unsourced.
Another reason should be common: A lot of people just post it in their own blog, again, without any source link and credit.
And no, even if they take them down, I still won't be uploading Ninjago fanarts. Some of us are already tired of this additional bullcrap we've been getting.
And "us", because I'm not the only one who has stopped uploading or taking down Ninjago fanarts.
And before you go "But at least it has your signature and some link in the picture!" or "at least I said 'art not by me; credit to anyone who made this!' " or "But your art is epic! I'm just sharing!", NO, it still doesn't justify why you still have to deliberately take them and slap them anywhere without any source link and credit.
Because hey, what's the point of me sharing if everyone else is just gonna go running around with my art without any source and credit? You're only upsetting us than admiring us.
PS: Yes, I am still angry. Don't expect me to forgive so easily.