I don't get how this works. Isn't someone down the line earning more profits than they would be in the smartphone industry? Like Obviously, the sheer resources

I don't get how this works. Isn't someone down the line earning more profits than they would be in the smartphone industry? Like Obviously, the sheer resources required to create a router are minuscule compared to a phone, so then who exactly will be pocketing these extra resources that I'm paying for, and why?