Since then, a few of my friends, who aren't into tech, almost installed MacKeeper. They all had a long history of using Windows and felt that installing some Anti-Virus, Anti-Malware junk was the most natural thing. For normal users it's really hard to distinguish between legitimate applications/websites and shady stuff.
Edit: I saw this quote on the Mackeeper website you linked (it is good design) "MacKeeper was noticed at Macworld by a journalist from Cult of Mac". So I chased that phrase and all I found was algorithmic page generators like this http://drgogek.com/is/is-mackeeper-really-a-scam-cult-of-mac....
Using a different tack CoM mention Mackeeper in a single page found from their search box, an affiliate promotion page ... using Google unearths more promotions, https://www.google.co.uk/search?q=site%3Acultofmac.com mackeeper.
So, it looks like their quoted reviews are from people they're paying to sell the product, that's a warning sign.
Didn't investigate further.
http://www.imore.com/avoid-mackeeper
> What's more, "uninstalling" MacKeeper doesn't get rid of all of it — you'll find various traces of it in your Mac's system library folder, and they take a bit to get rid of (just search for anything with zeobit or MacKeeper in the name, and you'll turn up files).
Even in the Mac App Store, Apple permits scammy apps such as "Memory Clean" [1] that consistently ends up in top ranks/top grossing. For one, "RAM cleaning" does nothing helpful and theoretically can make your Mac less performant. Bonus: the app calls home to push the developer's other apps.
I'm surprised stuff like this prospers in plain sight with Apple's tacit approval. Snake oil for non-power users who don't know better.
[1] https://itunes.apple.com/us/app/memory-clean/id451444120?mt=...
MacKeeper is a nasty piece of malware. I couldn't quit the program, it would immediately start back and putting it in the trash did nothing. Ended up having to boot into safe mode and remove.
Well as soon as I got it off my computer in Safe mode and restarted I get a prohibited sign. Mac will not boot. Ended up having to reinstall OS X. Thankfully you are able to reinstall and keep your files. Now I stay up to date on my backups!
I don't see why apple doesn't ban them. Obviously they are shady.