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Ok, so I WAS going to contact artists individually and privately, but that was before I realized there would be literally hundreds of artists.
The Youtube channel Super Hedgehog Bros is reposting and monetizing art from HUNDREDS of Sonic artists. In 3 videos alone, all posted within the last week, they have used art from over 100 artists. Their channel is monetized, they are making money from views.
100 artists from 3 videos. The channel has over 400 videos posted. They have over 60k subscribers.
If you're a Sonic artist, especially if you make comics, and you don't want your work reposted for someone else's monetary gain then you should probably have a look and consider if you want to do a copyright claim. Maybe let your friends know too, if you know they care about this sort of thing.
It's literally impossible for me to contact everyone about this, I just need to hope this post finds at least some of the people it matters to!