I noticed, that there is a person on Youtube that is stealing popular MMD videos and uploads it on his channel.
What's even more annoying, is that this person has audacity to create his own Patreon and upload there "his" videos. He doesn't even mention, that it's someone's work...
From more popular creators I found AquiNas and Inwerwm videos.
I will try to reach out to this guys to let them know ASAP, but please, be aware that there is such a person.
His Youtube channel link: https://www.youtube.com/channel/UCEZdpTld1F2CSm8FyOpk8YQ/featured
His Patreon account: https://www.patreon.com/KFDMM