>>70144342There's neither evidence for or against that they are getting paid.
However, even if they are getting paid, it would just be a cut of whatever the artist would make selling normally. Meaning Cover is stealing money from doujin creators through IP extortion.
Even if you think that's okay because you love large companies bullying private citizens, it goes against the narrative prevalent on here that Cover is hands-off and permissive when it comes to fanworks.