AMSTERDAM—The Dutch antitrust watchdog fined Apple 5 million euros ($5.7 million) on Monday, its fourth such fine for failing to allow software application makers in the Netherlands to use non-Apple payment methods for dating apps on the App Store. The Authority for Consumers and Markets (ACM) has been levying weekly fines of 5 million euros on Apple since the company missed a Jan. 15 deadline to make changes ordered by the watchdog. Apple asserts in posts on its websites that it has complied with the ACM’s December ruling that found the company was abusing a dominant market position. The Dutch watchdog said the company’s apparent concessions put “unnecessary and unreasonable” conditions on dating app developers. It singled out as problematic a requirement by Apple that the app developers that want to use non-Apple payment methods—which include Tinder owner Match Group—would have to submit a new app to the App Store …