Shaming artist for drawing het besides yuri is frankly just that "gold star lesbian" idiocy peppered up to outright thoughtcrime status. Most artists (especially western ones) rely on commission work, and the customer is always right. Would you blame a tattoo artist for inking the emblem of a rival sports team?
The natural constraint to this is "if a bar allows in nazis, it's a nazi bar" and artist not drawing the line at reprehensible things like conversion therapy (or even worse, creating that on their own volition) are not above shunning. Heck, even something like the shockingly common faceless male x LycoReco girls may be distasteful, but morally non-objectionable as long as there's no homophobic messaging involved.
Circling back to our mystery artist, I've never seen any of that guro outside of some asphyxiation/drowning fetish stuff and wonder if this is a sign of personal conviction or just being liberal in commissioner requests.