MacKeeper has been distributed by several different companies, latest being Clario Tech
I suspect that company gets to advertise here, because they are a legitimate company, who should be allowed to advertise to potential customers. Unfortunately, the poor reputation of the MacKeeper software is a difficult challenge to overcome on tech support sites that probably have a greater level of tech experience (on average), than other, more generic, tech forum sites.
The bad reputation of the software that they sell is a tough nut to crack. They even have a page
that appears to suggest that customers should contact antivirus sites that "incorrectly" list MacKeeper as "potentially unwanted" software.
I continue to trust Malwarebytes (for example), which continues to report MacKeeper as just that -- a PUP (Potentially Unwanted Program)
But, I also accept the possibility
that MacKeeper is an improved product now, and no longer warrants the attention that it receives, and actually does what it says, and is no longer an illegitimate POS, a "bad player", or other designation that may no longer be deserved.
However, I am not interested in testing that out, when there are other products that will do much the same task, without the "history" that MacKeeper brings with it... Should I have a need for such a product, or someone who trusts my recommendation asks about such products -- MacKeeper continues at the bottom of my list.