Paranoid Mage is awesome but its going a bit off the rails here. I think the author is going to have a major world building problem. The magic society is supposedly heavily within guardrails about what "is the proper application of magic." In the sense that if you are a healing affinity mage and recognize that healing magic to fix someone can also be used to seriously fuck people up. This is because you stepped outside of your lane and practiced "forbidden tricks." The only thing stopping this is encouraging mages to never study mundane science or any topic really at even a cursory and superficial level and get "bad ideas."
However the mage world has no problem driving cars, using computers, hiring IT staff, building server rooms, using phones, and so on. All of which require mundane knowledge to work. This is makes it hard for me to suspend the disbelief here. Some characters made passing comments about how mundane shit is dumb and they totally ignore it but then in the next page they're all using and interacting with it. It's not like Harry Potter where the magic world is like strictly divergent and you don't really have to interact with muggle technology in any meaningful way or anything. But you could if you want to.
Seems to me that outlaw mages would be a lot more common because all it takes to be an outlaw mage is to try a few things that you weren't explicitly taught. So everyone is completely unimaginative and goody two shoes by the book rule followers? He'll need to expand a lot more on this part of it for it to make sense in the grander scheme of things.
Maybe - but remember his only sources of info so far are the mage equivalent of yahoo answers, and a random girl that wants to teach herself with unrestricted general knowledge stuff from used bookstores. There's also no confirmation that he's actually right about healing - it could easily be a typical RPG heal style where it's a self guided smart heal and literally impossible to injure someone with it