Reklamer for MacKeeper skrev typisk at Macen havde "junk files" uden overhovedet at have skannet Macen for [[virus]] og/eller [[malware]]. Reklamen anbefalede at man installerede MacKeeper for at fjerne "junk files". Det kaldes [[scareware]].<ref name="tomsguide2">{{cite web|url=https://www.tomsguide.com/us/get-rid-of-mackeeper,news-21754.html|publisher=tomsguide.com|title=How to Get Rid of MacKeeper|quote="...MacKeeper will indeed scan your system for viruses, but...Here's how the ad campaign works: You'll see a pop-under ad while surfing the Web. It will say that your Mac is infected with malware and that you have to install MacKeeper to clean your machine. If you do decide to install MacKeeper, it will ask for your password, which may let it embed itself deep into the guts of your machine. At some point, it will stop being free and demand payment, which can range from $40 to $95 per year..."|language=en|access-date= 9. juli 2020|archive-date=13. marts 2022|archive-url=https://web.archive.org/web/20220313041811/https://www.tomsguide.com/us/get-rid-of-mackeeper,news-21754.html|url-status=bot: unknown}}, </ref><ref>[https://macsecurity.net/view/252-mackeeper-popup-virus March 01, 2019, macsecurity.net: Remove MacKeeper popup from Mac (Safari, Chrome, Firefox)] Citat: ''"...This holds true for the app called MacKeeper, which is a scareware sample disruptive..."'' [https://web.archive.org/web/20200709211730/https://macsecurity.net/view/252-mackeeper-popup-virus backup]</ref> Når MacKeeper først er blevet installeret én gang er/var den meget svær at slippe af med.<ref name="tomsguide2"/><ref>[https://www.imore.com/removing-mackeeper-your-mac 14 Jan 2018, imore.com: What MacKeeper is and why you should remove it from your Mac] Citat:'' "...There are lots of entities that are pushing unsuspecting users to download or buy software and services that have been reported to be of questionable value..." '', [https://web.archive.org/web/20200605141822/https://www.imore.com/removing-mackeeper-your-mac backup]</ref>
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