Yes, but there's a difference between making and charging for a mod, or making an unofficial remaster of, say, Fallout or Elder Scrolls, without any type of permission from Bethesda. Even if you're charging a price for it or not, doesn't matter, as long as you're doing it without the permission of the original author. At best (for you), it's bad etiquette towards fellow devs. At worst, it's an IP lawsuit waiting to happen (granted, that is less likely in the case of PL, but I'm mentioning it as a general rule).
Like Venris SFO who charges for overhauling Total War warhammer 3 and CA thanks him for his dedication you say?... We live in a society where we all want to make money from what we like. As I said, if you want to get paid for what you only do, write a book, if not... Leave morality aside when you use "condiments" in your product that you did not create.