this is not a valid point. a programs security does not lay in obscurity. closed source is obscurity. as an example pgp is open source and it does not mater because pgp was written in a way that there are no holes to exploit. malwarebytes does have vary good definitions for malware but that does not mean that it is not malware its self. if you have not seen the source code then malware bytes might be selling your information on the black market or mining it for the NSA. this is very unlikely but still posible and you cant prove me wrong because none of us can see the source code and say for sure.
