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?