You can't get banned because of posting someone else image, but for getting tagged by DTs it's still possible depends on the case.
This case was the example where someone claimed if those artworks were created by him, but he actually stole someone else artworks.
The reason for this may be that the images are not hosted on the forum, and if you have stolen an image from somewhere, you will inevitably host it in an image hosting service, which will inevitably delete it whenever the intellectual property rights are available.
It is true that you will not be banned, but you may get negative trust.