A "scrum course" is to Scrum what a code boot camp is to programming. You're going to learn basics but you won't have the depth of knowledge to handle complexity in any form, nor how to answer questions about Scrum that inevitably are asked by leadership. There's a reason the Scrum leader (or master) role exists. It's supposed to be the person who has a depth of knowledge that goes beyond a simple "scrum course" and can guide an organization when complexity arises. Organizations rationalize why they don't need to hire someone into this role because a Scrum leader isn't a producing role. And they're right that Scrum leader isn't a producing role, it's a role that's supposed to make producing roles more efficient, a force multiplying role.