The answer is yes? The person doing the drawing is violating copyright. I don't know why that is even a controversial question.
You are asking the equivalent question of, if I put a pirated copy of windows on my PC that I only use privately at home am I violating copyright, or if I sell copies of music for people to only listen to in their own home.
But this is even more damning, this is a commercial service that is reproducing the copyrighted work.
Edit: Just to clarify to people who reflexively downvote. I'm making a statement of what is it not a value judgement. And yes there is fair use, but that's an exemption from the rule that it is a copyright violation.
This would be more like if you reimplemented Windows from scratch if you have violated copyright law.
Let’s put it another way: if you decide you want to recreate Indiana Jones shot for shot, and you hire actors and a director etc. which individuals are actually responsible for the copyright collation? Do caterers count too? Or is it the person who actually is producing the movie?
You are asking the equivalent question of, if I put a pirated copy of windows on my PC that I only use privately at home am I violating copyright, or if I sell copies of music for people to only listen to in their own home.
But this is even more damning, this is a commercial service that is reproducing the copyrighted work.
Edit: Just to clarify to people who reflexively downvote. I'm making a statement of what is it not a value judgement. And yes there is fair use, but that's an exemption from the rule that it is a copyright violation.