Ok.
Positive suggestions and Factual
1 - There are no known Windows-like Viruses in the wild that self replicate and affect macOS, because of the underling UNIX Foundation and Permission Limitation.
The Operating System resides in a Sealed and Read Only Volume that can not be opened by the User nor by Third Party Applications.
2 - Any Third Party Applications that will interfere with the normal operation of the OS, is an invitation for disaster.
Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a portion on each sale.
What the Application may do to the computer is up to the User to check this out before purchase
Any of the below should be removed as per Developers Instructions
1 - Disk Cleaner
This will include CleanMyMac , aka “ BrickMyMac “
MacKeeper,
Dr Cleaner Pro Plus
Open Cleaner one Pro
Macmechanic
Clean my Mac x.
Third Party Security Software
This will include BitDefender ,
This will included Norton Antivirus
Sophos Av Software
Intego AntiVirus
McAfee,
Avast AntiVirus
Ad Guard,
Webroot ,
ESET ,
Avira ,
AVG AntiVirus
avira antivirus
Trustee
AntiVirus for Mac
F-Secure
Securemac
Cylance
Kaspersky Internet Security
Total Virus Software
VirusOne
Remove Virus One
The only Entity that can open and modify or alter this Volume is Apple.
That would occur when an update or UpGrade is performed.
The Only thing this Antivirus software is protecting is the Bank Account of the Developers and for zero return to the User aside from the problems this software creates.
AntiVirus Developers purposefully Market their product to create a “ Fear Factor “. In so doing, creating a False Need for their Product.
Security. Built right in
Mac app security enhancements
The Built in Security is all that is required to protect the computer.
Specific to CleanMyMac aka “ BrickMyMac “
To put the CleanMyMac is context and the damages it may have or has already done.
This application can or will Muck Up your User Account ( Home Folder ) of this machine.
It does not touch the Operating System itself unless you consider your User Account ( Home Folder ) as part of the Operating System
Then in that specific context - it has Mucked Up the Operating System
