Mac users now face the same scareware scams that Windows owners have had to deal with for years. MacDefender is one of a long line of “scareware” or “rogueware” software that tries to spook you into paying for a worthless program. The criminals monetize their work by collecting these fees, at least where Windows scareware’s concerned. The most recent version, dubbed MacProtector, dunks you with irritating pop ups, flashes an icon and opens pornographic pages in your browser.”]
Source: https://www.csoonline.com/article/2128602/everything-you-need-to-know-about-mac-scareware.html